I have a quadro fx at work and dual 7900 Gt's at home. To be honest, The dual doesnt do crap for you really unless you are playing video games or developing realtime shaders. And having a cleaner computer that gets reformatted from time to time makes a huge difference. My comp at work has problems running files that run just fine at home sometimes. I think that your best bet is to just go with a consumer level graphics card unless you have the cash to back up a moneypit quadro. Especially seeing that by early next year, computers are going to take a GIGANTIC leap in performance, and Vista will be right there to hog all the available resources up..
-Z