I would go with the Coolermaster HAF X
Its basically the same thing but the newer version of the HAF 932.
Also I would go with a Modular Power supply so you dont have those extra cables not being used getting in the way of the air flow.
If it were me, I'd go with the following.
The extra VRAM of the 460 is likely to be more useful than the extra cores of the 470. (Plus the 460 is cheaper.)
Can anyone else confirm that the 460 is a better choice than the 470? (Not that I don't trust you, would just love to hear additional confirmation)
And is there a good reason to get the HAF X other than that it is newer? (It costs substancially more, seems like its not money well spent)
I will look into a modular 850 watt Power Supply - any recommendations?
off the top of my head I know that the HAF X comes with air filters and the 932 doesnt.
I cant remember what the other impovments are but you could always make your own air filters to save money.