As Beagle sez, there isn't much difference between cake pres/converters. There wasn't much between the Vs100 and 700, anyway. The fader is cool, tho. And portablity. But it is good stuff.
If you are looking to spend money to upgrade your sound the best bets (in order) are room treatment, mics, preamps, effects and then convertors. A thousand dollars won't get you that much of a bump w/ them. Lynx is a proper "pro" unit and runs about $600 for a stereo channel, but needs a pci slot. RME is about as good, as is TC. A used UA is the next step up for a more analog sound, and they go for more like $2000, which will get you the new lynx and plenty of other clean units.
But the difference isn't going to be as dramatic as the right mic, or a new preamp. The rode is good, but there is better. A nice transfomer based preamp can add body to any recording.
If you don't need more inputs getting a mic and preamp combo would do more for your sound quality than replacing perfectly acceptable convertors.
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