Turning part of my basement into a playroom for the kids. It was a half done room with zero insulation and no outlets. Wouldn't mind keeping the 2x4 studs but not a deal breaker. I could gut it entirely and use the 2x4 for a wood storage over hang for my stacks out back. What is the best insulation to go with? I will be installing pex baseboard heat down there from the same zone as my master bedroom.