Maximum PC

I have some extra money and was wanting to know what games I should check out/buy...? I don't get the chance to play a lot because I have kids, but I enjoy shooters, rpgs, and racing games when I do have the time.

Here Are the titles I have,

Battle field 1943 (DLC)
Battle field 2
Battle field Bad Company 1 & 2 (Vietnam Expansion DLC)
Halo 1,2 & 3
PGR 1,2,3 & 4
Need for Speed Carbon
GTA 4 & both expansions (Ballad of Gay Tony and Lost and the Damned DLC)
CSI (Wifes Game)
Rock Band
Guitar Hero 3
Call of Duty 4 & Black Ops

What are your suggestions ??

If you like shooters, BLOPS is pretty much the best game on that list.

GTAIV is one of the most entertaining games that I've ever bought.

I know !! and multiplayer is quite amusing too!!

FPS:
- Halo Reach
- CoD: World at War (pretty good, you can find it for $20 or less, new)
- Bullet Storm (I demoed it, I thought it was total ass - you may enjoy it. some people think it's the greatest video game of all time)

Racing:
- Blur
- Split Second (I didn't like it, but, give it a shot)

RPG:
- Dragon Age
- Mass Effect 1 &2
- Tons of JRPGs as well. I don't like any of them, but if you hit up IGN.com and sort through 360 RPGs, you should be able to figure out which ones would be best for you to try out.

The Gears of War games are pretty fun, though I don't like the MP to much.
If you want a deep 3D fighter check out Soul Caliber 4 it's an absolute blast.
Assassins Creed 2 is awesome (If you care about the story you can get the first one I suppose but having played both, I'd just skip it).
The Crackdown games are pretty fun if you like the whole open world GTA feel with superpowers.
Farcry Predator Instinct was a pretty decent 360 rendition (note not port, it is its own game) of the series. Don't get Farcry 2 though, sucked =/
Mirrors Edge is a really fun "parkour" game. Just running along the rooftops and leaping across city streets is a exhilarating experience unmatched in any game.
For racers the Forza series is probably the best of any console game out there.
If you want a brutally hard but awesome game, check out Ninja Gaiden 2. Once you get the basics of combat it's one of the funnest hack n slash action games in existence. If Ninja Gaiden isn't your thing because of the difficulty Devil May Cry 4 offers similar gameplay. If you want to go WAY over the top, check out Bayonetta.