I am currently running an ATI 9600 with 256mb ram. I am having a lot of vedio problems. Can some one advise me which would be a good replacement card to buy. It has to be an AGP card, can be NVIDIA but would prefer ATI as my TV tuner works with it. 512mb or 1gb of ram would be ok but a real fast processer would be great. Tks, =Doug.