ATi drivers are fine, they are easy to install and they do work. They went through a period of having real issues with them, but that really is not the case any more.
Can you provide some sort of citation for the claims you are making?
I still don't think you should rule out any AMD card, it isn't like it is impossible, or even worse, to play HD on one than on a green card. I'm not saying you SHOULD go AMD, I'm saying you should consider them before you so hastily go straight off to Nvidia based on one person's claims and opinions. If the 560 lives up to what 87dtna is saying, then yes, it would probably be the better option, but nobody knows for certain before the cards are released