t3m3st

Gears and Rainbow 6 are actually pretty similar... I say get some variety in your library. Oblivion will take your life. Dead Rising is fun. You should rent it first, as the demo doesn't really tell you what you need to know about the game's structure.

There's alot out there. Try some demos.

I'm guessing you didn't have the first XBox, since you're asking about Halo 2. I was in the same boat. Maybe give one of the old Splinter Cells a shot. I picked up Chaos Theory and loved it. Doom 3 was great. Crimson Skies is a nice little distraction, and dirt cheap.

Also, get some live points and pick up Geometry Wars and Uno.

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I do it for the rare drops