Since you were looking at TASCAM, the UH-7000 is a very high-class interface for a great price. It is one of the "premium" interfaces that various manufacturers put out in the last few years. Stereo via USB w/ 2 superb preamps and great conversion. Latency is a bit high, esp. compared to RME, but the sound quality punches way above the weight class of its $400 price tag. Combine that with a WARM pre gives you the best of the preamp world - I like transformers in my recording path to "round' out the edges of the digital medium. Another $400.
I've heard that the 102 sounds better than the 107, too. Never have messed with them enough to endorse that position, but I would check out both if possible. Another contender that I can vouch for is the Microtech Geffel 930. As much a Neumann as a Neumann. $1000 for an LDC that sounds big as life, even and full-range. Plenty of highs w/o a bothersome edge to them. For an LDC it is tiny, but it sounds big. For another C note you can step up to the 70 series w/ the original M-7 capsule.
For less than $2000 the above will give you a high quality and flexible inputs - and output you won't have any misgivings about. If you want an improvement in sound, you will really have to step up your spending. For a no-compromise input, check out the RND Portico II channel strip.
have fun