Which Power Supply would you get, $ not an option?
OCZ ZX Series 850W Fully-Modular 80PLUS Gold High Performance Power Supply compatible with Intel Sandybridge Core i3 i5 i7 and AMD Phenom
Thermaltake Toughpower Grand TPG-850M 850W ATX 12V v2.3 & SSI EPS 12V v2.92 SLI Certified CrossFire Certified 80 PLUS GOLD Certified Active PFC Power Supply
System set up.
COOLER MASTER HAF 932 Advanced
COOLER MASTER Hyper 212 EVO
GIGABYTE GA-Z68XP-UD3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866
2 XFX HD-697A-CNDC Radeon HD 6970 2GB in crossfire mode.
ASUS 24X DVD Burner
& a blue ray player, burner I will be installing later in the near future
& a 240gb ssd, burner I will be installing later in the near future
& sound card, burner I will be installing later in the near future
& bluetooth card, burner I will be installing later in the near future
If I were you I would take corsair's HX850 http://www.newegg.com/Product/Product.aspx?Item=N82E168... . It is one of the best series ever made and it's manufacturer is Channel Well which is for years the best psu manufacturer. The only downside is that the HX850 is 80 silver while the others you suggested is 80 gold. Still the difference is small, so i would prefer HX850.
The final choice is yours.
You can get objective PSU test data on power and performance from www.jonnyguru.com, www.hardwaresecrets.com and Tom's so you know which PSUs are quality units as all Corsair, Antec, Rosewill, etc. branded PSUs are not the most reliable and you can't tell which are good PSUs without objective, scientific testing and internal component inspection.
Personally I lean to the Seasonic X Series, Antec SG / CP series, and Corsair HX series at 850 watts (other sizes of HX not so hot) ..... posted closest ones in size to where I couldn't find an 850 watter