I guess it depends on what type of games you like. Here are the ones I would want to buy:
Metal Gear Solid: Portable Ops,
LocoRoco,
Grand Theft Auto: Liberty City Stories,
Grand Theft Auto: Vice City Stories,
Ratchet and Clank: Size Matters,
Daxter,
Lumines,
Puzzle Quest: Challenge of the Warlords,
Ultimate Ghosts 'N Goblins,
Valkyrie Profile: Lenneth,
Mega Man Powered Up,
Crush,
Gurumin: A Monstrous Adventure,
Me and My Katamari,
Tokobot,
Sonic Rivals,
PoPoLoCrois,
...And I would get these ones once they come out:
God of War: Chains of Olympus,
Castlevania: Dracula X Chronicles,
Silent Hill Origins,
Final Fantasy: Dissidia,
Dead Head Fred,
Crisis Core: Final Fantasy VII