Any Games that are similar to Killzone 2 or Resistance, i'm more in to sci-fi shooters not COD series?

May be...

Try Half-Life 2 it's really good and you can get it in a pack called 'The Orange Box' where you get:

Half Life 2

Half Life 2: Episode 1

Half Life 2: Episode 2

Portal (puzzle game where you make holes in walls)

Team Fortress 2 (online multiplayer shooting game)

It's really good value

Well I think Lost Planet 2 would be a great game for you. It comes out in 2010 for PS3 I think. Its sci-fi and it has cool features like co-op and online competitive. I think this is just for you. And its a 3rd person shooter just to let you know.

warhawk is a good game nothing like cod