Well, my problem is PC games look pretty poor on my current laptop, however I am getting a new PC with i7 quad core, 8GB of RAM and 1GB of vRAM, so I might get a few more, namely Dragon Age Origins as they will actually look great.
I do already get RTS, as they are clearly superior on PC, despite my love of Halo Wars, but even then, it would have been much better on the PC as it would have had much more depth
Despite the cheaper prices of PC games, it is achievements and trophies which will stop me getting most games on PC