Right, long-story short, I have two on-paper builds that are roughly the same price (give-take 30-40$ either way) for two systems, totally identical only for two differences:
1. system A has a ATI 6870 with a 2TB WD Black
2. system B has a Nvidia 560 TI with a 1TB WD Black
Either at this point AFAIK will serve my needs, though I'm not really too sure on the 2TB drive, sounds like its the old too-many-eggs-in-1-basket problem that if it fails, ouch. Then again I feel that the 560 TI may be cheating myself too much money, but the CUDA support is valuable to me as I'm considering moving up to Adobe CS5...