I recently upgraded my PC, and am looking forward to doing some recording after some years.  I was disappointed to fin I can't install my MOTU interface, the card won't fit in my new PC. 
 
It looks as though I need to go with USB.  My new PC has a bunch of USB 3.0 ports, but no firewire or thunderbolt.  I have heard that USB 3 doesn't necessarily mean lower latency - my recording will be low number of concurrent tracks, but playback of many.
 
I'd like a rack form, and SPDIF connection.  I'd like to get something good, but value is a consideration.
 
If you've gotten into a new interface recently, and had good luck, I'd love to hear your thoughts.
 
 
 
 

I think the SPDIF is going to narrow your search, but look for features and look and the popular brands.  I'm starting to believe stuff like the RME and like (the expensive stuff) is nice, but just overkill for the home studio, unless you have the extra cash.  All the sub $1000 is great value and I don't think you'll choose something you'll regret, if it has the features you need. 

The RME products are expensive, but the MOTU products look good - if USB 2.0.  Then there's the Presonus Studio 192 which is USB 3, and has some nice features.  I can afford any of them, but want to make a good choice.

I just moved from an old SPS-25 (Cakewalk/Edirol) to the new RME Babyface Pro.  That RME is not a rack form, but by way of comparison with the 'cheaper' units my initial impressions are a little 'meh..'.  I do get reduced latency (about 4-6ms), but in sonic terms I don't hear a huge difference either on monitors or headphones.  Note that I've not really used the converters much for recording analogue signals, and one thing I don't like is that the analogue inputs are XLR only - most other units have a combined XLR and 1/4" socket.  USB 2 is fine.

schwa
I recently upgraded my PC, and am looking forward to doing some recording after some years.  I was disappointed to fin I can't install my MOTU interface, the card won't fit in my new PC. 
 
It looks as though I need to go with USB.  My new PC has a bunch of USB 3.0 ports, but no firewire or thunderbolt.  I have heard that USB 3 doesn't necessarily mean lower latency - my recording will be low number of concurrent tracks, but playback of many.
 
I'd like a rack form, and SPDIF connection.  I'd like to get something good, but value is a consideration.
 
If you've gotten into a new interface recently, and had good luck, I'd love to hear your thoughts.

USB 3 - check
S/PDIF - check
rack-mountable - check
XLR or TRS inputs - check
solid under Win10 - check
good value - check
 
Tascam US-20x20
 
http://tascam.com/product/us-20x20/
http://www.sweetwater.com/store/detail/US20x20
 

Beware that some "USB 3 compatible" devices perform better on USB 2 ports. As you narrow your choices be sure to circle back for verification from users who own that interface.

mettelus
Beware that some "USB 3 compatible" devices perform better on USB 2 ports...

This is a potentially confusing statement. Let's make sure we're not confusing "compatible with USB 3" with "designed for USB 3". 
 
All USB 3 ports are theoretically backwards-compatible, so they are compatible with USB2 devices.  So when you say "USB 3 compatible devices", that is theoretically including all USB 2 as well. 
 
Bottom line -- yes, it's true that it's preferable USB2 devices (even if they're labeled as "USB 3 compatible") be connected to USB 2 ports. 

JonD
All USB 3 ports are theoretically backwards-compatible, so they are compatible with USB2 devices.

 
Worth noting 'theoretically' here.  I couldn't get my RME to install when hooked up to USB 3, but it worked fine when in a USB 2 port.  Had a series of email exchanges with RME (excellent customer service btw) but we couldn't determine anything with certainty.  Depends as much on the mobo and other configuration I suspect.

Many USB audio interfaces have issues with 3rd-party USB3 controllers.
(Liken the situation to using a non-TI chipset Firewire controller with Firewire audio interfaces.)
 
Prior to the Z77 chipset (and derivatives), literally *all* USB3 ports were provided by 3rd-party controllers as USB3 hadn't (yet) been integrated into the Intel chipset.
 
With current generation motherboards, many have additional USB3 ports (in addition to the Intel USB3 ports).
These are provided via 3rd-party controllers.  Avoid using these with USB audio/MIDI interfaces.
 
To address the OP's question:
You won't go wrong with RME
MOTU's new AVB line is very good
 

Also remember that plugging a USB 2 device into a USB 3 hub will bring the entire hub down to USB 2 speeds. Same with an old USB 1.1 device (like some of the older audio i/f's) plugged into a USB 2 or 3 hub. A hub will operate at the speed of the slowest device plugged into it.