this could be interesting. I know ppl can swear up and down about both. =P

From experience, i have found (myself the general consensus) that Nvidia support is superior (Nvidia updates their drivers FAR more frequently than ATI). But i have owned an Nvidia series card for the last 4-5yrs, so that could be different now.

I know you want to get your rig around soon, so i would vote for A as well. If you can hold off for a bit longer, those GTX260's will be coming down to the 150+ range soon.