Now that doom is out...the next impending battle of the best video card will inherently surround VALVe's new alien sci-fi thriller Half Life 2. Now my 6800GT ran Doom3 1280x1024x2AAx8AF (Ultra Detail) at a solid 60 fps... How much of a comparison will HL2 be to Doom 3 in terms of demanding GPU/CPU power? Thoughtful responses encouraged.