Good Shooter PC Game?

Question

I have $40. I want a good shooter with a good story campaign.

This is my list of games I want, please say more or choose the 2 best.

These can't be M, Vegas as an exception. Also, no Aliens.

List:

Frontlines: Fuel of War

Rainbow 6 Vegas 2

Battlefeild 2142 with Northern Strike Expansion

Battlefeild Bad Company

Also if you know what the bundle price is for Battlefeild 2142 and Strike could you tell....not nessecary but I will put it to account.

Answer 1

Get with the flow and buy COD 4.  

Answer 2

You should try some of the valve shooters like TF2 and counter strike: source.