Games for my new PC :D

Well these are currently the hottest games on PC, Left 4 dead, Crysis, Crysis Warhead, Farcry 2, Team Fortress 2, Bioshock 2, World of Warcraft, Call of Duty 4, Call of Duty 5.

Killing floor, great game and doesn't take too much to run which will suit your gfx card.

If you haven't got a Steam account I would highly suggest getting one.
I was a guy who only bought retail and then I decided to give Steam a try and I have never looked back. Now I go down a game aisle and the first thing I think is if I can get that Game on Steam or if it will go on a weekend deal.
Killing Floor is a Zombie like type of Multiplayer Game that has waves of Zombies and then a Boss Zombie guy. I didn't like it and I'll state the reasons why.
First the Trader is annoying.
The Waves are not random but come at a fixed time frame and then you get a certain amount of time to restock and then more Zombies and then the Boss. If you are a storyline kind of guy there isn't one in this game. There's a backstory and that's it.
The Zombie Waves do get tougher as you countdown to the boss but there is no real campaign.
My son does like the game but for me it wasn't my cup of tea.
I'm enjoying CoD World at War which I play Co-Op with my kid. It's got a set campaign with a story line and is pretty linear. Not a real open map type of game but I'm not big into Open Map type of games. Clear set of objectives with a good story and I'm good.
I didn't see Mass Effect up there on your list of played games and if you enjoyed Deadspace you'll more than likely will enjoy it. To me it is one of the best Games I have ever played.
Well good luck and enjoy.

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for me atlantica online^^

in a couple of weeks there should be a fix for far cry 2 and then it's pretty worth getting.
btw no one mentioned STALKER.

Ah coming round to killing floor are we, i stick to normal myself, provides enough of a challenge especially on 10 waves.

Why hasn't anyone mentioned WoW yet... get hooked and before you know it 6 months have gone by

But really... here's some lesser-known titles that are rather awesome

Plants Vs Zombies (just awesome)
King's Bounty (Heroes of Might and Magic without the resource management or base building, quite fun)
Iron Grip: Warlords (Mix FPS with Tower Defense? Oh no they didn't!... well they did, and it's quite cool)
Demigod (Ever play DOTA maps on Warcraft 3? Same thing)

That's about all I'm playing right now...

OH! Street Fighter IV's coming out on PC soon enough! Deserves a mention.