make sure you got the power for it dude. The last lan we had one of the fellas had a 590 and he popped the breaker 3 times. We had to put him on his own circuit. 6990's I believe sit on the top of the pile for fastest card.
590 is basically dual UNDERCLOCKED 580's in sli. If you think the 590 is gonna be quiet your are mistaken. You'd be better off sli'ing dual 580's than a single 590.
If you are a folder get the 590. If you are not a folder get the 6990.
Oh and the ATI drivers are fine btw... I have zero issues with my card and everyone I game with with ati cards have zero problems too. I wish some of you guys could get your facts straight instead of assuming based on opinion and presenting false facts. It's ok to be bias toward your favorite card but please don't make stuff up based on your bias. There are some really good reviews on this site and elsewhere that would direct you better.
6990 beats 590. Everytime. Everyday. Forever. Sorry for being curt but it's the truth.
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Graphics card hierarchy this isn't a perfect list but it isn't horrible either.
Water cooling is absolutely worth the effort it is the loudest fan in your case. Period. If you can afford it definately do it. Dazmode can help you sort out the details if you like.
I honestly try and avoid these threads now because I really don't wanna get into the debate heh. Goodluck with your vid card