getting bored of my ps3. advice on some fun games?

[ps3-sales!]

my disk games- bioshock lbp fallout 3 buzz skate/skate 2 mgs4 resistance 2 c0d:war nhl2k7 socom gh3 uncharted gta4 and the orange box

downloaded- gt5p burnout paradise and like a bunch of smaller games

i've been thinking about getting killzone but i'm not sure if ill play it a lot. i like a good single player game just as much an online game btw