You should check out Siren! Its pretty cheap and you can enjoy in now rather than later. Its a download so you can do it from the comfort of your home and at the same time get around to installing the PS3 on your network.
For a dumpster dive you should definately check out NG Sigma, Heavenly sword, Genji 2 and Dark kingdom since they can be bought quite cheap. Sigma/Heavenly sword definately a good choice if you like action games.
Tease.