the halo games are worth the purchase of the system by themselves. Well...halo 2 only if you have xbox live. The single player was a let down, still great but...lacking. I still can't believe it.
if youre worried about money, go with a GC, since you won't be buying all that many games on your budget and the choice games are REALLY good.
Wind waker, the zelda collectors edition, REmake, Resident evil 4 coming soon, eternal darkness, MGS: twin snakes, Pikmins are fun, viewtiful joes, mariokart dd, and SMASH BROTHERS!
I didn't mention Metroid prime because I hate the controls, despite loving the art direction. Maybe you'd like em, so check em out.