New $750 gaming build

Heyyo! I'm going for a $750 gaming build and i just need some final tips and final adjustments

Purchase: August 15-25
Not Needed: Mouse, monitor, keyboard
Crossfire: No, never, maybe in 3 years if i can find the same card

I need to get a little lower in price, i'm like $50 over my budget AR...   but i want performance like below!

Games I Play: COD 2,4,5 TF2, Those i play online... Medal of Honor type of games i usually just play the campaign since i enjoy the campaigns in HD on those games and like AC...

Will the dual fan gpu's overheat less?

And Will my PSU be enough? I won't crossfire at all. but my Card is demanding and so is the cpu.

should i wait for bulldozer? or ivy bridge? Because if i do i gotta buy it NEXT august since i wont be in America when it comes out or the new keplar gpu's?

Okay so This is my build:

$80 Case --- COOLER MASTER Storm Enforcer SGC-1000-KWN1 Black SECC / ABS Plastic ATX Mid Tower Computer Case ATX PS2 / EPS 12V

$80 HDD --- 2x Seagate Barracuda ST3500413AS 500GB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive

$60 RAM --- Just your normal G Skill Sniper RAM

$65 PSU --- Antec BP550 Plus 550W Continuous Power ATX12V V2.2 80 PLUS Certified Modular Active PFC Power Supply

$120 MOBO --- MSI P67A-G45 (B3) LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel Motherboard

$220 CPU --- Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) 4 x 256KB L2 Cache 6MB L3 Cache LGA 1155 95W Quad-Core Desktop Processor BX80623I52500K

$189 GPU --- XFX HD-687A-ZDFC Radeon HD 6870 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity

$17 --- Random DVD Drive

$20 --- 802.11b/g/n Rosewill Networking Card PCI