I need help CHOOSING GAMES THAT I WILL BE GETTING FOR MY BDAY!!!!

I need help deciding on games to get... I am getting a game for my bday and a game for christmas.. The only problem is that there are three games that I am deciding on...

Call of duty 4

Mass Effect

Assassins Creed

Please somebody give me ur opinion on which games I should get and why.. Take this into consideration that I want a game that will take me a while to beat and is interesting not dule and boring. I love custimization in games.. I like playibng online as I hvave XBOX LIVE.. please no1 say that I should get all three games please!

no get halo 3 and gears of warkyle1942

I already got both of them!

Are you poor or something? I'm getting all those games, several more, money, clothes, and god knows what else just for Christmas.zeppelin6591

haha so ruude but so funny:P