If you read my post about drywall screw guns you know I have started a renovation at my home. I gained a lot of valuable advice by your replies - thanx so much.
Now I'm working on the plumbing. The hot water supply to my existing shower is weak - 1/2" copper. Yet the cold is very strong. I have 85 psi water pressure at my laundry sink. At this stage of construction I have the opportunity to run 3/4" directly from the town water supply after the meter to my hot water tank, then I would run 3/4" to the new bathroom (shower). After the bathroom I would probably reduce to 1/2" for the rest of the house. Once again I know the OFC members will offer advice/comments for this situation. Thanx guys.
By the way I am converting to Pex for the remainder of the project. I never used pex until yesterday - stuff is awesome. I guess everything I learned about soldering copper is now outdated! You wanna buy 2 butane torches, complete with solder, paste, & many copper fittings? LOL!