What PSN Games must I buy?

[raygun]

I have:
Shatter, looks good but got bored with it, ok though
Stardust HD- spent a lot of time on this, great game, 1080
Wipeout HD- must have, just to show what the PS3 can do, I play it often, 1080
Flower- another great, 100,000 blades of grass, beautiful, 1080
Battlefield 1943- good multiplayer game
Call of Duty Classic- play the first of the series, one I play multiplayer on pc almost every night
Zen Pinball- good pinball game
Warhawk- good but haven't spent much time with it, great graphics, steep learning curve
Gravity Crash- good old school arcade, cool retro graphics, music
Pixel Junk Shooter- just got this, seems great so far, similar to Gravity Crash but better

i've demoed:
Fat Princess- will buy eventually
Pixel Junk Monsters- good tower defense type game