I have a loose PCE Splatterhouse I could offer you, but other then that got nuthin. I kind of considered picking the PS1 Raiden Project up again here myself but I am kind of in the same boat as you concerning how the soundtrack sounded. It did feel a little busted to me also. Its one of those games I'd prob pay $15-20 for but not much more. You can try taking it to ebay but I think there is like 16 copies of it for sale currently on PS1 so I am not sure how much good it will do you unless you price it lower then a lot of others.
EDIT: Take that back, I still have a few other PCE games, but they are not on your list. Magicoal, Pomping World, Ankoku Densetsu and Neutopia II. Currently they are listed for auction along with Splatterhouse but if you actually wanted something I could prob pull it for you.