hello all. im going to get a gtx 670, i just dont know which version to get. the 2 gig, or the 4 gig. i will be using this card for at least a couple years, and will be using a resolution of 1080p, but MAYBE higher later down the road. i want to be sure that with games coming out this year and the next, that im not limiting my card due to memmory limitations. any help and opinions would be great. thank you