Call Music Direct and ask them about Sumiko's trade-in allowance for the Blue Point line. I just got $100 off a Blue Point Evo for my old BPS-II. Couldn't hurt to ask...
Depends how fond you are of the BPS. As former owner I came to find it so wiry and bright that I would have given mine away. But if it sounds good to you in your system, most replacement carts might well sound dull and overly laid back. Good luck.