If money is no object and you want it right now, pickup a 7800gt or gtx. they're the top cards on the market and in sli they smoke everything out there. in the benches ive seen one of these will beat 2 6800's in sli. only downside is you need a pci-e motherboard for that.

I never noticed a problem with ati's drivers, but right now nvidia has the top spot in the gamer card market.