#1 - Samsung Spinpoint F3 1TB. It's the best and it's $55 on Newegg today--but not for long.
#2 - If gaming is your focus and you're spending $1,000 you should get a GTX 570. It's got GTX 480 performance, which blows the pants of a GTX 460.
#3 - Good PSU, but I'd go with an 850W or 950W because I like the freedom to SLI and overclock high-end cards and CPUs. Go with a Corsair, Antec, Season, Silverstone, or XFX.