Which Call of the Duty shall I choose?

ok I am going to buy a game call Call of the Duty and there are three Call of Duty. I don't know which one to pick so please post your reply which one is the best:

Call of the Duty 1( $21)

Call of the Duty 2($29)

or

Two Packs with Call of the Duty 1 and 2. (will be little expense-$83) 

Be aware that CoD1 w/UO runs very poorly on a 8800 GTS  at least over STEAM.. I'm talking about REALLY low FPS.

And no it isn't my drivers or anything else.. I can run Infernal at max settings running at a crisp avg of 60FPS, also on STEAM. 

I have tried looking online for a solution to no avail.. CoD 2 though runs perfectly :)

you can get cod, cod:UO, and cod on steam for 40 bucks do that and you don't have to worry about your cd getting scratched up or loosing your key