Dont get anything less then a 4GB card! I went from a 4gb to a 6gb card and it made a big difference ! You can check your vram usage with Nvidia Inspector.

 

Evga has a 90 day step up program: http://www.evga.com/support/stepup/

 

Thanks, will look into the step up program. 

gtx 770 4gb will rock your world.