+1 for the 460. If you're uncertain about your memory and are willing to spend the extra money over the G Skills, then take a look at the Mushkins. These guys are well respected by enthusiasts and overclock easily. They're also quite durable with lifetime warranty. I also agree that you should take a good look at the CoolerMaster case.
I wouldn't be too concerned about assembling it yourself. It's probably just as easy if not more so to assemble a system now as then. You'll likely enjoy it more that way too.
Good luck wit hthe build and enjoy the new system!
