Don't get Secret Agent Clank, I heard it was abysmal, but do get Size Matters!!!
Here is a list I recommend for you:
Sony PSP Games
Burnout Dominator
Burnout Legends
Crisis Core: Final Fantasy VII
Daxter
Def Jam Fight for NY: The Takeover
Dragon Ball Z: Shin Budokai
Dragon Ball Z: Shin Budokai – Another Road
Gitaroo Man Lives!
God of War: Chains of Olympus
Grand Theft Auto: Liberty City Stories
Grand Theft Auto: Vice City Stories
Hot Shots Golf: Open Tee
Hot Shots Golf: Open Tee 2
Killzone: Liberation
LocoRoco
Lumines
Lumines II
Medal of Honor Heroes
Medal of Honor Heroes 2
Metal Gear Solid: Portable Ops
Naruto: Ultimate Ninja Heroes
Naruto: Ultimate Ninja Heroes 2: The Phantom Fortress
Pursuit Force
Pursuit Force: Extreme Justice
Puzzle Quest: Challenge of the Warlords
Ratchet & Clank: Size Matters
Ridge Racer
Silent Hill: Origins
SOCOM: U.S. Navy SEALs Fireteam Bravo
SOCOM: U.S. Navy SEALs Fireteam Bravo 2
SSX On Tour
Syphon Filter: Dark Mirror
Syphon Filter: Logan’s Shadow
Syphon Filter: Combat Ops
Tales of the World: Radiant Mythology
Tekken: Dark Resurrection
The Warriors
Valkyrie Profile: Lenneth