i think mass effect is going to do well on the pc. It always seemed when i played it on the 360 that the game would play better with a mouse and keyboard than a controller. the game has enough content to keep pc gamers playing for a while unlike many ports that are only 12 hour games.

Fps -HL Series or Crysis (For true pc gamers because they are one of the few that can run it)

RTS- Starcraft, Total Anhalation, or DOTA

FPS online- Battefield, Call of Duty, or Steam online fps (like CSS)

RPG- Oblivion

Racing- Trackmainia Lawls