Hmmm, go play Killing Floor or Tomb Raider.

You chose, I'll play.
After finishing my current backlog which consists of goats, crying babies, transvestites with capes and some bricks, I'm going to max the hell out of Dishonored, at least beat Fallout 3 and look at Lara's boobs (29 for Bioshock to 29 for TR, so for now I'll pick TR).
Thanks for help guys! ^_^

If I find any moar munnies next month I'll make a giveaway of Dishonored.

The three "musts" for me would be:

1) Bioshock - With 7hrs playtime I'm guessing you haven't finished it. It's in my top 10 games of all time. If it's been a while since you started it I'd recommend restarting again as the story is such a big aspect of the game you don't want to be hazy about what happened in the beginning. Not much to say other than it's an absolute classic. Ranks up there with the Half-Life's as the greatest games of all time.

2) XCOM: Enemy Unknown - It can be super tough for the first few hours but it evens out once you get a hang of the game mechanics and it just generally gets easier as your squad improve and you get better weapons. Once you get over that initial difficulty curve you should start to really appreciate the game as things start going in your favour. You get really attached to the squad that you build so each and every move you make is one that takes a great amount of thought as you don't want to lose any member of your team. Like with Bioshock, this is in my top 10 favourite games of all time.

3) Deus Ex: Human Revolution - One of the greatest games of the last decade. Incredible in every single way. Deep, twisting story about some pretty big topics that most games would be afraid to touch on. Great gameplay that lets you play however you want (become a walking tank, a sneaky assassin or a hacking expert). If you like it I would suggest you check out the original Deus Ex which dwarfs Human Revolution. Both incredible games, but the original is far superior yet seems to be more difficult for people to get into. Go with Human Revolution first and if you enjoy it immediately get the original (it's usually about £1/$2 in sales).

As for the rest:

4) Thief Gold - Incredible game, especially if you are a fan of the golden age of PC gaming (late 90s which saw Half-Life, Deus Ex, System Shock 2 and Thief among others). Is a great game which set down the guidelines for all stealth games that followed it. Feels really rewarding when you manage to sneak through an entire level undetected. A classic.

5) Penumbra: Overture - Great little survival horror game. Pretty scary in places, but sets the scene for the much scarier sequel Penumbra: Black Plague. Both amazing games. From the makers of modern horror classic Amnesia, so expect to be crawling around hiding from monsters. Very tense and rewarding stealth-horror game. Turn off the lights and put your headphones on if you want a truly nerve-wracking experience!

6) F.E.A.R. - Awesome FPS action-horror game. Even today this stands as one of my favourite shooters of all time. Nothing groundbreaking in the story side but is just so much fun to play. Slow-mo shootouts with walls and furniture breaking and flying everywhere is insane fun. Mix in some ghostly scares and you have a pretty unique game. Very ahead of it's time.

7) Fallout 3 - Looks like you've played a bit of this. Not my go-to RPG, but it's fun if you really get into it. You can easily lose like 50+ hours of your life if the game clicks with you. The kinda game you wanna play if you just wanna lose yourself in a world for weeks and weeks.

8 and 9) Borderlands and Dead Island - Both fun games, but only if you have people to play with. Not much fun on your own, so wouldn't recommend either if you can't find any one to play with. Both provide lots of hours of entertainment but don't expect anything groundbreaking. Just kill things with your friends. That's all there is to it, there's nothing deeper than that if you're more into the story side of things.

10) I dunno :P