I recently installed Windows 7 on my iMac and I'm looking for suggestions for games that would run well on my system. I have a 27' 2.7GHz quad-core Intel Core i5 and AMD Radeon HD 6770M model with an upgrade to 12GB of RAM. The games I own and enjoy on my iMac are Bioshock 1/2, Deus Ex, Batman:AA, Diablo 3, The Witcher, and Limbo. Any suggestions for Windows games that I may enjoy and would run well on my system would be appreciated.