Ok, well for Halo, congratz. For Mass Effect, good luck trying to beat that in one day, i think thats impossible. Some good games for the 360 would be Dead Rising, Guitar Hero, and Crackdown. Those games rock.
i got one like two years ago and now im onto my 4th xbox 360!!!I love the system but it breaks down to easily. Games I would perfer, Halo 3, Mass effect, assassin creed, crackdown, burnout paradise(not in markets yet till the 22nd) and guitar hero 2 & 3