Thanks for all the suggestions. I'll definitely get CoD 4 at some point, probably need to play through 2 (which I have on my computer) and 3 (which I will probably get on xbox) first. Re: party games - hate 'em, want to puke every time someone comes over and wants to play raving rabbids on my wii (so I traded it in). Also "rhythm" games like ddr and guitar hero, I won't buy those for myself (kids can get them if they want). They're not fun, maybe because I'm horrible at them, but the whole idea is just "meh" to me.
I asked for Lego Star Wars Complete or something for my DS, so I probably won't also get it on the xbox. I'll check out Worms, Lumines, and the demos as soon as I get it networked. I may sign up for an account on an online game rental service, have you guys tried them?
Also, Z@NARDI, I really hate "realistic" driving games. They don't feel realistic to me - I can drive my car > 100mph and never go off the road. I can feel when I'm going too fast and when I'm about to go out of the lane. I can do the same at 120mph on my bike. But on every racing game ever, I have a hard time keeping the car on the road in the corners. I like "arcade" style racing games like Cruisin', Rush, and Excite Truck.