Corsair is a brand that has an excellent reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty.
That is a quality PSU.. However, 850W is more than you'd need for your selected components.. Though, its not bad to have headroom for future upgrades or additions.. Am not sure about the cable management features of the HAF 932 though.. May be you could've opted for a modular PSU such as the XFX 750W Black Edition..
If I were you I would go for the ANTEC TruePower New 650W (82$ after rebate). It's modular, more efficient and has four PCIe connectors, so it is able to handle even two 5870 graphic cards without using any molex-to-PCIe adapter.