Halo 3: Lone Wolves - 44
Team Slayer - 38
Team Doubles - 46
Team Snipers - 25
MLG - 20
Team SWAT - 28
Halo: Reach: Brigadier Grade 2 - 73% Armory Completion
I bought every Halo game to say I've bought them all. They're all good games, but if you don't want to do it for the same reason as me, I'd say get Reach because it has firefight, but better. If you want to play the ODST campaign, go for it!