Well true as the ATI issues are there's 2 reasons to use them over Nvidia:
1. HD3870X2 or newer beats all but the most expensive Nvidia cards maybe all with new
HD4xxx series.
2. CrossfireX works on Intel & Nvidia chipsets, SLI only works on Nvidia because they
make it so.
Reasons not to use ATI:
1. Drivers suck, great, suck, rinse repeat
2. Fan (as in not work w/o manual control) and PowerPlay (as in card drops out of 3d
or lowers clock rate) bugs on all but a few makes/models of HD, BIOS updates
supposedly forthcoming.
3. VPU Recover AKA driver loops where card stops responding seem to be more frequent
& without cause or solution.
With all the issues I've had, I would not switch to Nvidia give #2 & then #1 of
reasons to use ATI.