if i buy all 5..... it should cost me $140 or something.

if rent at blockbuster then it should be like $40.

how much would gamefly be and how does it work?

It's like $20 a month, but only like $10 your first month. They give you two games in the mail. You play them until you don't want them and you send them back. More games come from your list on their site.

lets say i get 2 games and finish them that same day. i send them in tommorow..... when will i get the next 2 games?

It depends how far you live from one of their distribution centers. Mine came around 3-4 days after I sent them in.

Those 3 GoWs here cost 30 euro total I say buy them.

i know im gonnna have to play the god of war games to know to story. but is the killzone story worth it?

Agreed

i think im gonna rent all the god of wars. ill probally buy all 3 of them when god of war 3 comes out :p and i might bother playing the killzone games

I think you should get God of War 1. I don't know much about Killzone 1 or Liberation. I didn't play God of War 2. However, get God of War 1. The game is amazing.

Rent is fine.