Opinions & Suggestions on this build

Qty. Product Description Savings Total Price
1

COOLER MASTER HAF 932 Blue RC-932-KKN3-GP Black Steel ATX Full Tower Computer Case
Item #: N82E16811119213
-$20.00 Instant
$179.98
$159.98

1 SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
Item #: N82E16822152185
Return Policy: Standard Return Policy
$74.99

1 ASUS Crosshair IV Formula AM3 AMD 890FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard
Item #: N82E16813131644
$229.99

1 CORSAIR CMPSU-850TX 850W ATX12V 2.2 / EPS12V 2.91 SLI Ready CrossFire Ready Active PFC Power Supply
Item #: N82E16817139009
-$30.00 Instant
$10.00 Mail-in Rebate Card17-139-009
$159.99
$129.99

2 OCZ Reaper HPC 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model OCZ3RPR1600LV4GK
Item #: N82E16820227527
-$10.00 Instant
$15.00 Mail-in Rebate Card20-227-527
$277.98
$257.98
($128.99 each)

2 G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBRL
Item #: N82E16820231277
-$10.00 Instant
$219.98
$199.98
($99.99 each)

1 AMD Phenom II X6 1055T Thuban 2.8GHz Socket AM3 125W Six-Core Desktop Processor HDT55TFBGRBOX
Item #: N82E16819103851
-$10.00 Instant
$209.99
$199.99

1 COOLER MASTER Intel Core i7 compatible V8 RR-UV8-XBU1-GP 120mm Rifle CPU Cooler
Item #: N82E16835103055
-$20.00 Instant
$10.00 Mail-in Rebate35-103-055
$79.99
$59.99

1 XFX HD-585X-ZAFC Radeon HD 5850 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card w/ Eyefinity
Item #: N82E16814150477
*
Microsoft Windows 7 Home Premium 64-bit 1-Pack for System Builders - OEM
Item #: N82E16832116754
-$15.00 Instant
-$10.00 Combo
$409.98
$384.98

Subtotal: $1,697.87

I would like to know if there are better price/performance components that I may exchange in your opinion. It has been like 4 to 5 years since I build a new system. I am also planning to OC the cpu to maybe 4ghz and the graphic card as well, of course I would have to read a lot more in order to keep myself from frying anything. I will for sure go with the cpu and mobo no question about that. thanks in advance for any advice. ahh, also need to know which gamer keyboard and mouse would be best. I was no sure of which Ram to choose so I listed those 2 but you can tell me which could be best other than those..