One of my best is :
Need for Speed ProStreet (you need to have excellent quality ForceFeedback steering to enjoy this game at it fullest...I used Logitech Momo Racing Wheel). Not too arcade but not freakingly copy real simulation (which is imposible as we cant feel the innersia of the car when we play computer game..do we?)
Need for Speed Underground (For tuning freak). It even got dyno meter ..woot
CityLife 2008. This game kinda Simcity but at bigger scale. Pretty good for city builder/planner wannabe. Challenge your mind to control social and economy. Hook me on my computer chair for countless hours, until i conquer the gameplay.
Crysis : The ultimate FPS game on the planet to date. But you need high end gaming rig to enjoy this monster at it fullest (direct x 10, highest possible setting). The AI, physisc and object interactivity really mind bogling. Cant stop playing until I almost fainted (more than 48 hours playing).
Command And Conquer 3 : Pretty good and modern RTS game. Espcially if you play CnC franchise. I start to play this game when they release CnC Red Alert...then play Tiberium Wars etc. Currently, the new expansion was released but got no time to buy and play it coz too busy with solarose.
GTRII : This is pure driving and racing simulation. You mandatorily need Force Feedback Wheel (or steering) with analog controller. Even gas pedal and brake pedal play important role. But..play this game if you are racing (simulation) geek.
Bioshock : Pretty good FPS game. really nice graphics and innovative gameplay.
World of Conflict : Get a high end graphics card and you will be amazed. My 8800 GTS 512 still seem not very capable to handle this game at highest resolution and quality setting...duh
Warhammer 40k : I play all the expansion. Really good RTS games. Fast action but still require some strategy.
Ever green game : Starcraft and Warcraft 3. I prefer Starcraft still..and still play with my friend over lan party.
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Game which i going to buy and play :
Assasin Creed
CnC Kane Expansion
Warhammer 40k Dawn Of War 2
Starcraft 2 (this autumn...cant wait...argghhhhh)