USAGE FROM MOST TO LEAST IMPORTANT: Gaming then movies not really into any of the designing or editing ect.
CURRENT GPU AND POWER SUPPLY: 8800GT with 500W
OTHER RELEVANT SYSTEM SPECS: Gigabyte GA-P35-DS3P upgrading to 8gb of DDR2 aswell
PREFERRED WEBSITE(S) FOR PARTS: Not really Fussed but I live in Australia but I dont mind international sites
Tom's Hardware gets users from literally all over the world. Knowing the pricing and availability of parts relative to where you live will help us (the community) to help you (the original poster) better.
The GTX650TI Boost is a decent card. I'd definitively recommend that over the others. Depends on your resolution as far as 1 vs 2GB. I'd lean to 2GB if the price difference isn't huge. 1GB should be fine as I'd assume you would turn on AA and other eye candy things that suck up VRAM.