Then you need to wait for the next generation of consoles to come out. Multiplatform games have pretty much maxed out on graphics by now since the graphics units of the X360 and PS3 just can't handle anymore than current gen graphics.
So unless the developers spend extra time and money on pimping the PC versions of their games, we're not going to see much better graphics on the PC until the next gen of consoles arrives.
Since it's going to be another two years or so until that happens we will only be seeing marginal visual improvements for the next couple of years.
Maybe there'll be a few PC exclusive titles that will stand out graphically in the meantime (like Crysis) but I wouldn't really know of a single one in development right now.