What FPS has the best graphics? Don't get me wrong - gameplay matters much more (heck - I have a Wii...that should be obvious

). I'm just not a hardcore gamer, and I'm interested in how far things have advanced. My graphics card shouldn't be a limiting factor (512 MB onboard), but I'm running Windows Vista, so now DX10.
I've still got the original Doom.

Almost all of my games are old with horrible graphics (Myst!). I'm just curious what the top graphics are for the market today for FPS games, or any games for that matter.
Thanks!