To me at least, there is a point where top-of-the-line converters don't help to make a better end product. Sure, audiophiles can tell the difference between $1500 converters and standard pro-level ones, but the end consumer sure can't. Particularly in a full mixdown, where you have adlibs, many tracks of music and drums, etc. I think that to some extent, if a consumer can't discern, then it is wasted money.
Way more important than the recording gear is the recording techniques. The techniques will make the biggest difference. Once the techniques are down pat, then go for the best equipment.
Not withstanding that rant, you should start with something halfway decent. I would recommend the Delta products or STAudio C-Port DSP2000. They're features are very comparable (i think the dps2000 has the edge there though). The quality is similar (delta has a slight advantage), but the DSP2000 will run you $400, while the Delta 1010 is $650.
-=bumpus=-