Memory for XFX nForce-790i Ultra SLI?!

Hey there. Im currently on a mission to upgrade my PC significantly for a beter game experiance with the latest games.
Going with those parts:

Intel Core 2 Quad Q9550 CPU
2x XFX GeForce 8800GTX GFX cards in SLI (Had 1 of them from before and since the GTX's are cheaper then the newest ones 2x in SLI of those should work for a while)
XFX nForce-790i Ultra SLI, DDR3 MB
Corsair HX1000W Black PSU
Windows Vista Home Premium or Ultimate 64-bit (Comes down to the memory ill end up with)
And HDD to be decided

And I'v come to the point where Im stuck with what memory (DDR3) bricks to get brand, memory, speed etc. But when I get down to the memory I kinda want to try go fimd some decent ones that will work fine with the setup and will preform good for gaming, and in a resonaable price range. But I live in Norway so Im not sure how big of a price range in dollars i am looking for.

If you have any ideas please let me know.=)

Well one of my sort of problems was to find DDR3 compatible with my mobo. Well got to have a check on XFX site

And no I havent exactly even thought about moving to a ATI system, dunno maybe I will maybe i wont. First of all im gonne let a good mate of my play a bit with overclocking once i get the system i plan to get complete

I have the setup you mention, but with the 9450, and use OCZ platinum 1600. (4 x 1 GB chips). OC is at 3.4, was rock stable at 3.6.

My ram use has yet to go over 60% on any app or game, using Ultimate 64, and the 8800 GTX's still handle everything fine at 1920x1200.

All that said, I would be hard pressed to do the same now, if starting from scratch.

2x 4870 crossfired for ~ $500 would be a great contender!