Hi there, and thank you for coming to the Forums!
We certainly do carry interfaces which are Windows 7 compatible. In my opinion, the best cross of quality and economy would be the Line 6 Pod Studio UX2. I'm quite familiar with Line 6 products, which tend to be of a very good quality, and apparently this unit is no exception. You can read a good review HERE.
Most recording interfaces will work with Windows 7 as long as they work with Vista, as they are mostly just a standard input device. The most important factor is whether the interface works with your software of choice (ie Steinberg's CuBase, n-Track Studio, Garage Band for OS X, etc.) and whether the SOFTWARE is compatible with Windows 7 (both CuBase and n-Track are.)
I hope this information is helpful for you!
Cheers,
Greg
