A plumber will likely be able to best answers any specific questions that you may have but from what I have been told by inspectors , CPVC or PVC) is currently the best type of piping. I would also recommend contacting a few insurance companies to obtain at lease 3 estimates with your current polybutulene pipes.I learned about that a fews years ago when my inspector told me about a house we was inspecting and he said the insurance would be high because of that we did not bother with the house bacause it would have cause 8-10k to redo the pipes in the house.
Best Wishes to you
First of all, a plumber will likely be able to best address your plumbing-specific questions, but from what I have been told, CPVC (different than PVC) is currently the best type of piping. I would also recommend contacting a few new insurance companies to obtain estimates with your current polybutulene set-up.
I wish you the best!