Bioshock(though it is only single player)

Quake Wars(I still haven't tried it though)

Orange Box(5 awesome games in one)

Call of Duty 4(single player is short but multiplayer rocks)

Crysis(personally, I don't like slow paced stealth games like this)

Oblivion(perhaps the greatest RPG even if there are games like The Witcher and Hellgate London)

Command & Conquer 3 Tiberium Wars or World in Conflict(if you like RTS)

Assasin's Creed(if you can wait for February)

Turok(gamespot is giving A LOT of attention to it so it should be pretty good)

Guild Wars(it is currently the secondbest pure online game second to World of Warcraft)or World of Warcraft(if you are willing to pay not only for a CD but also for the playing time)

Are you looking for a new game because you are finished with all of them? Because if you are, then you could either just keep on playing Guild Wars or buy Hellgate(if your PC can handle the specs).

If you don't want to follow any of those options, you could either look for any of the old games(like Freedom Force) or just simplyupgrade your PC.

If you like the RTS genre than FPS, then buy World in Conflict.

If you like the FPS better than the RTS and you like a fast- paced game with good multiplayer and single player, then buy Call of Duty 4

If you like FPS but you prefer a slow- paced, stealth game with hardcore graphics(and if your PC can handle THE GOOD graphics), then go for Crysis(I regreted Crysis when I bought it because the game had a slow pacedue to allthe stealth that you had to do).

Since you won't devote a lot of time for WoW, don't get it. To play it, you need to buy a CD and aside from that, you also have to pay so that you could play and it would be a waste if you won't play it for a long time.

Though I still haven't played The Witcher, I heard it was pretty good.

If you like to play a game somewhat similar to Diablo but with better graphics, then buy Hellgate(though when I checked its rating in gamespot, it was a little lower than expected)

Call of Duty 4:

The Good: Hardcore shooting, good storyline and better setting(at last, the World War 2 environment is over)

The Bad: The single player is too short(still haven't tried multiplayer)

Orange Box:

The Good: 5 games in one and all of them rock!(there is nothing bad about this game)

I still haven't tried Unreal Tournament though

Bioshock if you like single player games

But if you can wait until February,then buy Assasin's Creed.

Bioshock, Call of Duty 4 and Orange Box.