I have yet to play the God of War: Ghost of Sparda demo on PSP (downloaded it).
Sengoku Bassara: Samurai Heroes was very awesome. Definitely loved the demo and made me more hyped than I already was.
As for Quantum Theory, I kind of enjoyed it. I like how the story was setup in the demo and liked how it gives me the Japanese vibe for a game. My only complaint was the slower controls. I'll buy it one day.
Since I spent too much money, I'm going to hold off on Eyepet. I might still buy Start the Party on release, but I may hold.
WHAT??? Uraizen sold the 360.