Here's a pretty good setup. You need to spend more b/c together, the processor and the GTX will put out around 300W of heat.
Swiftech MCR320 Radiator $55-65
D-Tek FuZion or Swiftech ApogeeGTX CPU Waterblock (70+) (Only get the GTX if you plan on upgrading to a quad any time soon)
Swiftech Stealth 8800 VGA Block or EK FC-8800 Waterblock (110-120)
Swiftech MCP655 (80)
Swiftech MicroRES (20)
Masterkleer 7/16" Tubing (15)
3x Yate Loon DS12-H (3.50*3 @ Jab-Tech)
Barbs, etc (??)
TOTAL COST: ~$350-400
That's about as good as it can get for a lower budget. Good luck dude.