Bah, no way in hell I'm going to download Halo. I don't like that game. I think CS:S is the best choice.
By the way ginacarlo, yeah, that is a pretty famous gun, it's cool that they accualy have it in the game, realistic. Hehe, one time in CS:S, I just sat behind a pillar next to the terrorist bomb site, because all my teamates were dead, and it was a 5 on 1. So one by one, the four guys come up to the bomb site, and I kill them with one hit by the shotgun. Then i pick up one of their AK47-type weapons (I was outta ammo) and just killed the fifth guy with a headshot.. good times, good times.