Thinking of buying 4 games with my 360

I'm looking to purchase a 360 soon and get around 4 games with it. I've read the reviews on gamespot but i wanted to hear from users, what do you all think of these games and are they a good choice to start with?

Halo 3

Madden 08

Gears of War

Bioshock

Some of these games are similar in genre, so is it wise to diversify, or are these games good enough?

Here you go:

Gears of War

Mass Effect

Any sports game

Rainbow six vegas, or GRAW2

I highly recomend

Bioshock

Gears of war

halo 3 but the campaign won't be much good to you if you haven't played 1 and 2 so if you get it without following the story get live aswell

and

assasin's creed for somthing different

woah. Hold up now while i go and smash my face with a brick. Assassins Creed is anything but a disappointment. Its a brilliant game even if ur looking at it from a technical stand point rather than a gaming p.o.v. Still a god game to play tbh.drgoth2006

o...k then i just said it for somthing a little different

Gearsofwar (if u dont have a quality PC)

Cod4 (for MP)

Kameo (good game and will cost alot less now)

Halo3