Your RAM is good. If your budget allows you may want to consider going with a GTX 570 for lower power consumption, lower heat, and better performance. If you plan on running 470s or 570s in SLI you'll need a 800W-850W PSU, I recommend the Corsair HX-850. It's modular to help with cable management and has plenty of power and a good warranty. If you go the GTX 460 route I would recommend a 1GB model, especially if your resolution is 1920 X 1080 or greater.
As far as cases are concerned, Antec is pretty well regarded, especially it's 300/600/900/1200 series, along with its Dark Fleet Models. I've got a Antec 900 and I like it, although my bottom video card sits a little bit closer to my PSU than I would like, but that's also partly my motherboard's fault as well.