what should i get for new psp game?

i really want a new PSP game but i dont know what to spend my money on,

Based on the games that i have can someone offer me addvice on what i should get based on the games i allready have and are bored of

Call Of Duty, Wipeout Pure, NFS, and Dynasty worriors

thanks

These are all good games to pick from 

Metal Gear Solid: Portable Ops, Syphon Filter: Dark Mirror, Daxter, Tekken 5: Dark Resurrection, Ratchet & Clank: Size Matters and the two GTA games(Grand Theft Auto: Liberty City Stories, Grand Theft Auto: Vice City Stories) if you like GTA games.

ok thanks ill search into that

any personal favorites from you guys?

Syphon Filter- Probably the best PSP game yet

Tekken DR - Amazing, even with PSP's poor D-Pad

My all time favorite game: Monster Hunter Freedom (though hard to find).

Also, Syphon Filter, Daxter, Gurumin, Medal of Honor: Heroes, Medal Gear Solid: Portable Ops.  NFS and Wipeout Pure (which you have) are decent games, but try one of the Burnout games (Legends or Dominator), they are by far the best racers on any portable system.