Help me Choose what PC games to buy?

First of all i'm new to video games i only have Crysis Maximum Edition and COD MW2

This games on sale for a good price only today at Steam

1) COD, and, COD 2, COD 4: modern warfare, COD united: offensive, COD World at war. all this for only $30



2) Battlefield: BC2 -alone for $33.49-



3) Civilization IV: $9.99



4) BioShock 2: $14.99



5) grand thert auto IV: $4.99



6) Borderlands: $4.99



7) Killing floor: $4.99



8) Left 4 Dead 2: $9.99



1st: should i pay $30 for the selection of " COD "

OR i pay $33 for only BC2 ?



2nd: is this games are good to buy even if it's a bet old? and which one it will be good to buy?



i know it's not the Games section but i guess there's nobody at the games section today



thanksHelp me Choose what PC games to buy?
Get the COD games. better deal and the games rock. i play COD 4%26amp;5 all the time. so worth it dude.Help me Choose what PC games to buy?
Here is my current gaming list:



for 360:



-I am trying to finish Red Dead Redemption up. I have to get it totally complete and I play MW2.



For the PC, I have The Sims 3.



I get bored of them all after an hour or so. So I guess that means I have a life :D YAY! ME!Help me Choose what PC games to buy?
Left 4 dead 2 is a great game, get that =]