you might want to get core i7 3770 to take advantage of hyperthreading. You will also need at least 8 gb of ram. i also recommend getting a higher end graphics card such as the gtx 670 to take advantage of the cuda cores
For quiet get a Fractal R3, Noctua case fans, Noctua D14 CPU cooler, and use elastic suspension for your HDD (Google it). However, that can get fairly expensive (Noctua is). You can get Cougar for case fans as well.
Well, I'm about to build a "quiet" gaming computer and I am going with the Fractal R3, the Hyper 212 Evo (it's not THAT loud...) and some Cougar case fans. Go with 140mm fans... they are quieter (still move a lot of air at lower RPM). However, if you want to look at quiet case fans, just google it... there are quite a few roundups on tomshardware alone geared towards "silent" fans.