Should I buy a PSP this Christmas?

[Durrsomething]

I was thinking if I should get a PSP this Christmas, but can't make up my mind, I would like your opinions and what games I should get. Was thinking these games:

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Power Stone

Castlevania

Darkstalkers

Dead Head Fred

Loco Roco

Disega

Gurumin

Medievil

Patapon

Gradius

Ghosts N' Goblins