I have avoided computer-based recording because I try to keep 90% of my recording time focused on the music, versus the gear. I have been happy with the Tascam 2488 neo integrated hard disk recorder/mixer. I want to dip my toe in Sonar, mostly to be able to more easily collaborate with other musicians, mixing in drum and keyboard tracks recorded by others. 
 
I'm looking at the Tascam US-4x4, Focusrite 6i6 and Steinberg UR44 interfaces. Any opinions on which one might sound best or be most hassle free with Sonar? 
 
One advantage of the Tascam unit is that it comes with Sonar LE, so I could try the software and upgrade at at discount if I like it, or return the unit within 30 days if I don't like the software or the unit. 
 
Is there any benefit to Tascam and Sonar being in the same corporate family, in terms of drivers that are kept up to date, etc.?
 
Thanks!
 
Paul

I'm happy with the 6i6.  Just saying.
 
Its a well built and supported piece of kit.

I am switching my PC DAW audio i/f from a PreSonus 44VSL to a Tascam US-16x08 (arriving tomorrow). I could never get the 44VSL driver to play nicely with my iLok. I arrived at the Tascam decision before I knew that it was part of the same family as Cakewalk. Yes, it has great mic preamps. Yes, it's a well-built piece of kit. But the primary reason I picked Tascam was that they moved their driver development back in-house, at least for their new lines, like the US-XXxXX audio i/fs. PreSonus haven't updated the drivers for the VSL i/fs in over a year, in the face of numerous complaints and documented bugs and mal-behaviors. They have been totally silent, hanging their forums mods out to dry.
 
When I buy a piece of kit that I plan to give significant use over an extended period of time, I need to know that the supplier is on my side, vis-a-vis my beneficial use of their product. I'm buying the company as well as the product.
 
But that's just me. And I'm nowhere close to perfect.

My vote goes to Focusrite. I have had a VS-100, and a Tascam 2x2, as well as a Toneport UX2. I had issues with both the Roland and The Line 6. The Tascam was ok, but I like the way Focusrite thinks...and works.

I'm very happy as well with my Focusrite 6i6

Another happy Focusrite customer here (18i6). However it seems good things are starting to happen at Tascam again... or so the rumors go.
 
Still Focusrite makes good gear with good support for a good price. Can't miss.

 
I like the Steinberg UR-44.  The Yamaha preamps are nice sounding and the inboard DSP is really convenient for me on vocal mikes.  It was easy to set up.  No glitches or instability.  I've never tried Focusrite, but I certainly would not attempt to override the consistent high marks their products receive on this forum.

I have a 6i6 and it's great. But I also have an older Tascam and since they updated the drivers last Dec it's working better than ever. The Scarlett still has better drivers overall but I think the new TAscams are working out top shelf.
That deal with Sonar LE is well worth it. That is how I got my upgrade to X3 studio for only $99. LE came with my Roland A 49. LE is so basic it is not a great way to try Sonar. Your better off paying a monthly fee as there seems to be no demo for Sonar anymore, and I would try Artist or Professional first. LE doesn't come with very good soft synths. It's only good point is it's value as an upgrade pathway. 

I've reviewed a ton of interfaces over the years. I'm currently using the TASCAM US-4x4, which replaced the audio part of the V-Studio. I was having lots of instability issues with the V-Studio and because I had access to the TASCAM to try out (hey, it's a Gibson Brand), I gave it a shot. I was extremely impressed with the mic preamps and also appreciated that it had a MIDI 5-pin DIN connector. 
 
I then did some tests to see if the specs matched what I thought I was hearing. The results of those tests are here, and speak for themselves. Note that these are real-world specs - I tested noise with the mic pres up, ditto crosstalk.
 
Of course, Focusrite makes fine interfaces and every one I've tested over the years worked well. The only issue I ran into was that with the USB interfaces, the +48V phantom power measured around +35V on two units I tested. It appears to remain a problem as someone from Gibson tested one on the floor at a GC, and it was still +35V. However, virtually all condenser mics work fine with +35V so I don't think it's a significant issue.
 
Some people find the Focusrite mixer applets confusing because there are quite a few mixing and routing options. The TASCAM applet is extremely bare bones - no internal mixer or DSP, just output routing and sample buffers. I was told by TASCAM all the parts cost went into the discrete mic pres, and I believe them. However, they're all Class A which means that USB does not provide enough power to the unit. It requires using an AC adapter so bear that in mind if you expect to be the 4x4 in a portable application involving a laptop.
 
I've also used the Octa-Capture and really liked the mixer applet, the fact that it could expand the V-Studio, and the auto-level set function (which I think is great). Although quite a few people in these forums have reported stability issues, it worked fine for me as long as I kept on top of the latest drivers.
 

The Steinberg UR44 is a great value. I switched from a Roland Quad Capture in order to get more inputs and UR44 surprised me with all the other things it does.
 
Two headphone outs that can be mixed individually, Independent main volume, not connected to phones. Phantom can be activated on 2 or 4 inputs independently. Hardware DSP that integrates into the included plug ins. Software mixer for the interface and 4 amp sims in hardware and as plugs.
 
It also comes with a light version of Cubase but if you use Cubase it does offer some amount of integration into the DAW. It also works great with Sonar.