I7 920 p6x58d build

APPROXIMATE PURCHASE DATE: Tomorrow or next day

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Video editing & gaming

PARTS NOT REQUIRED: i7 920, asus p658d, hyper 212+ cpu cooler, 1.0 TB black WD hd, monitor

PREFERRED WEBSITE(S) FOR PARTS: newegg.com

OVERCLOCKING: Maybe SLI OR CROSSFIRE: Maybe in future

MONITOR RESOLUTION: 1920x1080

ADDITIONAL COMMENTS: I need help with graphics card selection, one of these or another in $300 price range. I favor the toxic because of extra cooling and quieter operation, but like the warranty on XFX. I might want to add a second graphics card in future.
Also, i am not sure of which ram to use. I probably will not overclock but might just to play with it. Do you recommend other ram that would be comparable quality but at less expense?
Lastly, is power supply adaquate for this build?

SAPPHIRE TOXIC 100282TXSR Radeon HD 5850 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card - Retail $349 http://www.newegg.com/Product/Prod [...] 6814102881

or

XFX HD-585A-ZNBC Radeon HD 5850 (Cypress Pro) 1GB Black Edition 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported ... - Retail $339
http://www.newegg.com/Product/Prod [...] 6814150454

LIAN LI PC-60FNW Black Aluminum ATX Mid Tower Computer Case - Retail
http://www.newegg.com/Product/Prod [...] 6811112252

LITE-ON 24X DVD Writer Black SATA Model iHAS424-98 LightScribe Support - Retail
http://www.newegg.com/Product/Prod [...] 6827106335

CORSAIR CMPSU-750HX 750W ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS SILVER Certified Modular Active PFC Power ... - Retail $149
http://www.newegg.com/Product/Prod [...] 6817139010

Microsoft Windows 7 Home Premium 64-bit 1-Pack for System Builders - OEM
http://www.newegg.com/Product/Prod [...] 6832116754

CORSAIR XMS3 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model TR3X6G1600C8 G - Retail $209
http://www.newegg.com/Product/Prod [...] 6820145236

or

CORSAIR XMS3 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMX6GX3M3C1600C7 - Retail $189
http://www.newegg.com/Product/Prod [...] 6820145286

Much thanks!

cant go wrong with either, get SAPPHIRE TOXIC to get the all blue theme!!
ram is fine at that price.
and yes that Psu is fine.