What kind of plumbing should I use to replace PB tubing?
If you want to re-plumb with copper you may want to invest or rent a tool to use fittings made by these companies: Nibco press system, Parker Zoom Lock, Ridgid Pro-press, or Viego. I have used 2 of the above and they work great. You cut the copper to length, add the fittings, then use the tool to crimp the fitting and you are done, No soldering. It makes a professional out of a novice.  Myself, I would solder or silver braze. (my choice)