Best games on the psp

What are the best games for the PSP, by best i mean most entertaining and last a long time.

socom fire team bravo 2

twisted metal head on

syphon filter dark mirror

Also

Metal Gear Solid Portable OPS

Burnout

Daxter, Burnout, GTA: LCS and VCS, Tekken: DR, Marvel: UA, Syphon Filter, Sid Meier's Pirates!, MGS: Portable Ops, Killzone: Liberation, SOCOM... and more.

Crush looks pretty badass too, I'm going to check it out.