^ I played through RE:4 on gamecube and bought the Wii version the day it launched. It plays a million times better than the GC one. For $30 you really can't go wrong.
RE:UC is a pure shooter the story isn't that great but it is fun to blast zombies. If you don't like that sort of gameplay don't buy it.
As far as must haves go, you are missing Metroid Prime 3 from your list. It is the best FPS on the Wii and even if you haven't played the first two, you will still like the story. (I never played the first two so I can honestly say this)
MoHH2 is a good FPS but there is absolutely no story to speak of (other than the standard issue lone hero in WW2 fair). I bought it in Dec and haven't beaten it yet if that tells you anything. ( Iplan to this summer though, one of the first gmes on my list actually)
