Regular dilema: What to buy?

Hi, first of all, I'm sorry for creating a topic like this, I know there are alot of similar ones.

So, I just faced a regular dilema: What to buy? I'm looking at KZ2 and R2. I really like all Insomniac games, but I hated Resistance : Fall of Man. I liked the demo of Killzone 2, even controls felt awesome to me, but I want a game with a great replay value, and Resistance 2 haves co-op... So can anyone help me? ASAP. Thanks.

I say resistance 2. I too hated the first one, but i have really been enjoying R2. especially the multiplayer online.

i have all games ecxept the non-released RE5 and reccomend resistance 2