The big clincher for a lot of people will be the HL2 and source engine performance ati is currently showing against Nvidia. Hate Ati drivers myself and I have been put off their cards because of it, but the results speak for themselves. I'd like to see some 'real' results, not just from Valve before I finally make up my mind though, and by the time I need a new card there will be new ones from both anyway I suppose.
ATI have taken alot of flak for their drivers (which were until 6 months ago rubbish). But as an owner of an r9700 and between me and my friends we have ~12 machines with ATI 9k-series cards, and I must say they have been performing great. No issues with the drivers or support. I put a Zalman heatpipe cooler on mine, no moving parts completely quiet. I can reccomend ATI, from my own and my friends experience, but your milage may vary.
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