Gaming with alienware

just got an Area-51® 750i AlienWare comp and I wanna start gaming online...can anyone recommend me any fun online games...from strategy to 1st person shooters...basically anything fun I'm not too picky on genre's

Okay no offense but your first mistake was buying that over priced alienware computer ... My friend learned that the hard way when he bought a computer from them and I built the exact same one for a third of the price, Sorry but they are nice looking and come with a lot of features

NOTE::: OKAY BEFORE BUYING OR DOWNLOADING ANY GAMES MAKE SURE YOU CHECK THE SYSTEM REQUIREMENTS TO KNOW IF YOUR COMPUTER CAN RUN THEM!!!

Anyways ... Back to your question.

It depends ... if you want FREE online games there are tons! Note that most of them are mmorpg's though.
Here are some of my favourites:
-Rappelz (MMO)
-GunZ (3rd person shooter)
-WarRock (1st Person Shooter)
-Cross Fire (1st person shooter)
-Combat Arms (1st person Shooter)
-Fiesta (MMO)
MORE GAMES HERE: http://play-free-online-games.com/index.html

If you're willing to spend some money and buy games check out:
-Diablo (Strategy)
-Crysis(DEFINATELY!!!) (1st person shooter)
-The Orange Box
-World In Conflict (AMAZING) (Strategy)
-Call of Duty 4 (fps)
-Fallout 3 (fps)
-GTA 4 (Strategy 3rd person shooter?)
-Guild Wars or WOW (but try to stay away from WOW)

For more games check out Game spots list of PC games: http://www.gamespot.com/games.html?type=gamesplatform=5mode=toptag=subnav;all

If I helped did please click ↓↓Yes↓↓ under here, thanks! =]

Guildwars.

Agreed guildwars, and Anarchy Online is good.
Atleast if you are good at twinking xD