I recently treated myself to an old PSX, having missed it, because I was a saturn fan.I've got some pretty cool shoot'em ups for that one, but what are the best shoot em ups for the PS that are not available for the Saturn? I have Gradius Gaiden, Einhander, Raiden Project and R-Type Delta, and they're very cool and stuff, but I know there must be more. What do you, the experts suggest?