DIII is going to be awesome...as long as it's free.
Bioshock 2 is interesting me also
Probably more games out there but I haven't done much research.
PC > Consoles in my opinion.
It can do just about anything a console can do, but can also be your pvr, homework, work, multimedia, etc... Opportunity for better graphics, games can be more involved and updated, and computers are fun to tinker with (if you like tinkering).
My opinon on Computer vs Consoles is as follows...
The big difference between the two is lack of multiplayer. Most people buy a game to play with their friends, one copy, 2 controllers, and/or now 4 controllers, and play together. PC's are generally one person to one machine making sharing an issue. PC's can also be tedious in learning new games and expensive to meet proper requirements; and with windows throwing a new OS every couple of years and MAC being linux based and more expensive, the computer gaming market isn't be helped with compatibility issues. The PC does offer some great games though, DOTA being one of my favorites even though its old. L4D made a split screen mode which, in my opinion, every fps should offer. Splitting a game across 2 monitors can be more intense than a console split screen (my opinion) anyday. Also, with controllers (i like the rumblepad2 or 360), pc's can almost meet the console on the couch feel (with lcd tv's out now), though it's all dependent on the game developer if it supports such devices. PC's are generally free online, 360 charges, ps3 doesn't.
I prefer pc games to the point that it's all I own. None of my friends play pc, they're all console dependent, and there's nothing I can do to change it. PC's have gone down considerably to the point a $100 dollar graphics card and a $50 processor can play COD4 just as good as a $600 ps3. Games are also generally cheaper than the higher console engines, but it also has virtually no resale value. Wow, am I rambling?