Hi am going to buy a new pc soon need advice on graphic cards. I know that i need NVidia card but am i better off buying a single expensive card like GTX 295 or would i be better buying 2 cards run as SLI like GTX 275 1793MB or GTX 285 2GB.Does 3D Coat use both cards and would it be an advantage to have between 3.5GB 0r 4GB of graphics memory. Finally regarding system memory thinking of 12GB is this allright.