I would buy Devil Survivor costumes. Will probably get the Catherine and Raidou costume sets since they look pretty good. The Persona costume sets other than the one for Dancing are all really disappointing though. School uniforms are boring as hell. Persona 2 had so many great character costume designs and they just went for boring school uniforms? Bleargghhhh.
I agree on the costumes, but that Innocent Sin battle theme tho...