Right now I have two 22" monitors running on DVI @ 1680x1050 with a 512mb dual DVI graphic card, I edit 1080i/p video with Vegas x64.I am upgrading to one 40" LCD TV running on HDMI @ 1920x1080 (same as my footage I edit) is it worth it to get a 1gb graphic card? Will it look JUST AS GOOD with a 512mb card as it would on a blu-ray player? Would a 1gb card make it look BETTER then a blu-ray player?

Also, my monitors are 2ms on the response time, the new 40" is 8ms, does this 6ms loss affect 1080HD video playback or?