Tascam Drivers-- Sorry but your info is outdated. The new drivers are way better and a Tascam will out perform many of the interfaces that get recommended here. The drivers were bad under XP so people are still thinking of those days.
 If you don't own one, or have ever used one please don't review one.  At the price point you pay it gives you 16 inputs. Nothing else comes even close. 
There are definitely units with better RTL but the price will triple. The OP is looking for low latency so should pass over the us1800 as the RTL will be to high for him... most units in the lower price range are the same.  

My info is based on helping people on the forum.  there are still many people who have problems with the tascam drivers, even if you only count that they need high latency to operate!  high latency is due to the DRIVERS!  only a small portion of the hardware affects the speed of the drivers.

I like you, Johnny, but I think I've earned the right to recommend whatever I want without your approval and without actually owning one because of the help I've given to people on the forums over the years.

I would consider a digital mixer. Some give you 8 channels IO over USB with 16 input channels or more. If the routing is flexible enough, you can still use all of your gear. You just cannot route everything separately through your DAW. You can have low latency, excellent fidelity and flexibility.
Also, I am not sure how much latency will hurt you. The DAW can compensate as long as you are not trying to listen to an instrument processed by your DAW while you are playing it , e.g. you are playing a keyboard, and you want to digitize the analog output, run it through the DAW to add effects and listen to the output while playing. Many VST (or other) effects have such a long processing delay that the delays in the interface and the driver don't even make a difference.  
I have I MOTU UltraLite mk3, and I like it a lot. The CueMix makes it super flexible. You can daisy-chain units, but I have never tried it.

Wilko

Hey Beag not offence intended especially to you as I have a lot of respect as your help here is monumental. But my point is the complaints about tascam drivers are over, There was defiantly big issues under XP, Me included, I stopped using it as I could not even run soft synths and MIDI would not work. 
I cannot speak for all, but I have read almost every thread here that pertains to the Tascam interfaces, and on Gear slutz too. I never read one that was a issue with Windows 7 64bit drivers. Any issues are with XP 32 and Vista 32. The Vista driver were particularly bad. 
My conclusion is the W7 drivers are now average and about par for the course with any interface under $300. 
But, you need to consider that the best use for these interfaces is the 16 inputs for live recording of audio. In this respect the us 1641 and the newer us 1800 is a phenomenal unit. Nothing comes close for that price. The units are made out of steal and not plastic. The features are all top notch too. The pre amps are better than most. 

The drivers are not a problem, I never have issues. Sure my round trip latency is between 10 to 12 ms but so are lots of usb interfaces. Especially under $300. So to say the drivers are crap needs a recap, Yes XP and Vista drivers are crap, W7 64 bit are "fine" not the best in the world, buy an RME if you want perfect. 

Hope this makes you change your mind about bad mouthing tascam , Your welcome to bad mouth Behringer I'll back you on that ha ha.. 
Cheers! 

OP sorry for ranting in your thread  and don't buy a Tascam us 1800 if you want excellent drivers, but if you'll settle for average then you have nothing to loose.  

I like behringer! 

at least for some things.  I have near fields by behringer and a couple of other pieces.  some things they make are crap, tho. 

I agree with you that tascam is better than it used to be.  but I will still not recommend them because there are better alternatives out there with better drivers.

and just for the record, I have read at least a couple of 1800/2000 posts on here where they ended up taking them back because they couldn't get them to work without very high latency (70msec round trip!).  I don't know if I could find them again, but I know they're there.

if you don't care about latency, the unit is very cheap for a lot of inputs.  <== maybe I can live with that kind of recommendation.

Lynx USB.  8 or 16 in/outs.  Of course, $2000 or $3000.

Roland is showing off a brand new USB interface this month at NAMM.

Roland Studio Capture.  16 analog inputs. Looks like an impressive unit on the surface.

http://www.rolandconnect.com/product.php?p=studio-capture

Hopefully it'll include updated preamps and conversion. If it's old technology in a bigger box, then it might not be such a great unit. 

Bonzos Ghost


Roland is showing off a brand new USB interface this month at NAMM.

Roland Studio Capture.  16 analog inputs. Looks like an impressive unit on the surface.

http://www.rolandconnect.com/product.php?p=studio-capture

Hopefully it'll include updated preamps and conversion. If it's old technology in a bigger box, then it might not be such a great unit. 

The way it is advertised it appears to be an "oversized" Octa-Capture (12 XLR IN instead of 8, plus 4 TRS IN, 2 of which are optionally COAX). Features are pretty much the same as with the Octa-Capture (4 monitor mixes, auto-sens, VS EXPAND to link a second unit).
 
So I don't think it's anything new other than (almost) 2 Octa-Captures in one box, but hopefully sold cheaper than 2 Octas.
 
Not a bad unit, though, if you need the I/O channels ... I quite like the Octa-Capture ... still no ADAT connectivity which is a drawback ...

Hm. The Studio Capture looks interesting - at least one UK retailer's listing it as a "pre order" price or around £800.

FreeFLyBertl - out of interest, what kind of (stable) round trip latency does the Octacapture give you? I'm curious if it does a better job than its UA-101 ancestor - the minimum the 101 driver allows is (according to Sonar) 9ms @48KHz).

Sorry to say Johnny but I own a tascam us 800 and when I changed from 32 bit computer to 64 bit computer running windows 7 , it keeps crashing my computer with the blue screen hardware error .... downloaded the newest drivers and still no help ... now I have a roland quad capture and have had no problems at all .... so I will have to say there still problems with the drivers ... some systems still won't work with tascam ... i''m new to alot of this recording hardware so I can't recommend anything but only tell what issues I have had ...