I would definitely WAIT for NVidia's next card. NVidia is releasing a high-end 40nm card, quite possibly in the next two months.
Not only does the 40nm mean less power (and noise) right off the bat but the card will definitely use new power management techniques as well. ATI's just released HD4770 is 40nm and very, very impressive for price and power utilization.
Trust me, it's really worth the wait just to have a quieter computer.
Generally, you want something like this for your setup:
1) graphics cards (blow hot air out the back)
2) CPU Heat Sink Fan (HSF) + 120mm fan
3) 2x 120mm low-noise, low CFM (1 near CPU, 2nd at front-bottom if possible)
The goal is to have great cooling right at your hot components and secondly provide adequate air flow through the case. You can buy high CFM fans to move the air which produce a lot of noise but really don't provide much cooling where it's actually needed.
I like the Antec 300 case. For an SLI/Crossfire setup I'd use the side fan mount but find the quietest case fan possible. This creates a nice path for those two graphics cards to intake air then expel out the rear.
Modern ATX cases are very poorly designed in terms of air flow but it is possible to build a relatively quiet PC with good planning.
hi guys thanks very much for the help truthfully its really appreciated,
now the case is the my main problem at the moment as will be buying it in 1 or 2 days just really stuck on this at the moment really had my heart set on the armor+ mx but im starting 2 hear negative things so i had a look at the haf 932 yeah its in my price leauge but not 2 sure on the looks so any suggestions would be fantastic, im looking for quiet more than looks though, cheers, GAZ