Need a new PSN Game

I was going to get Flock. My most anticipated game of the year, until I played the demo. The game has some very bad gameplay that is keeping me from getting it. So now I have to find a new game to download. I have Super Stardust HD and Crash Commando. Love both. I would like to say that if you have not played Crash Commando to give it a try. Its a great side-scrolling shooter. Also there are flying tanks and jeeps! Call of Duty fans will enjoy it. But now for a game to get. I cant get Warhawk because I dont have enough money. And I have Burnout on disk. I was looking at getting Worms. Has anyone played it on XBLA or PSN yet? Can anyone reccomend me some games on PSN?

EDIT: I may hold off on getting something if what I just read is true. There may be some Killzone 2 DLC around the corner. And on a second edit I would like to say I think it is. Time for an article.