There's pretty well no such things as uncompressed editing. There's also nothing that shoots video without some form of compression either.
Vegas as it stands ingests, edits and renders DV25 using the same compression system that the camera that shot the video used.
If you want to go to LESS compression than DV25 be prepared for a HUGE hike in the cost of cameras, then add on the cost of lenses to make all that worth while. I've had footage shot at 10bit 4:2:2, stuff looks stunning, in fact downconverted to DV25 (yes lots of data gets lost and there's more compression) it still blows anything I've seen taken on ANY DV25 camera out of the water. But the camera is at LEAST 10 times the price of any prosummer DV25 camera and cameramen that know how to use them aren't that cheap either.
If you really want to handle DV uncompressed (this CAN be done) you do need pretty serious hardware, data rates are very high. For 10 bit 4:2:2 SATA RAID 0 off a hardware controller is adequate.
At the moment the Declink cards are the only way to ingest the footage. SD Connect at this stage doesn't provide for capture without compression to 8 bit 4:2:0 / 4:1:1 (DV25). It should be able to do this soon.
Once you have the footage into Vegas though Vegas will only render out to 8 bit 4:2:2 at best, this may change, we live in hope.

If you want to try any of this out for yourself you can, just render out to uncompressed and see how big a file you get for say 1 minutes of video. Divide the answer by 60, thats how much data you need to be able to pull off a disk system in 1 second to print to tape or to preview. Now that's an absolute minimum for one track.
Of course I only mentioned cameras, VCRs for the next step up from DV25 are another huge step up in cost, I can only quote figures in local dollars but you can buy a very good DV/DVCAM deck for $3000, to get a DigiBetacam deck like a 500 will set you back say $80,000, bit more if you add some option cards.
Hope all this helps.
Bob.