I like Daxter very much, so I just got PSP Daxter Entertainment Pack - Ice Silver version for a couple of days, and have enjoyed it a lot. it's a deal price of $200, you can look up:
dealstudio.com :: View Deals - :: Deals, Coupons, Rebates, Freebies, Discounts, Bargains
But you can also wait for the new released God of War PSP bundle until in June
God of War PSP bundle with 'Deep Red' unit in June - Joystiq