Uponor ProPEX & Viega ProPress
After the bathroom demo, I removed all the galvanized plumbing in the bathroom and replaced it with Uponor ProPEX. My home was built in 1964 so fortunately the galvanized pipe was still in pretty good condition because it was US made at the time. Extremely thick walls on the pipe. Don't get me wrong, there is plenty of rust in the pipes and some of the fittings were near their end of life.
I replaced all the galvanized pipe that I could reach in the attic as well and replaced it with PEX. In most instances I was able to cut out a section of the galvanized pipe with a four-wheel pipe cutter (you don't need full rotations) and then thread it out of the union, tee or elbow. This was made easier by the liberal use of spraying "Free All" rust eater on the joints and letting them sit for up to 30-minutes. In a few cases I had to cut the pipe and then re-thread it using a die.
Since the other bathroom was already done in copper several years ago, I just cut out all the dielectric fittings connecting it to the galvanized pipe and then used Viega ProPress fittings. These fittings are a game changer since you don't have to sweat a fitting anymore.
When it comes time to demo the kitchen, we will do the same thing and replace all of that plumbing with PEX.
At some point we will have to break open a narrow path in the ceiling and wall where the main 1" water line comes in so that it can be replaced with PEX.
You can't help but give props to the folks that plumbed homes during this time with galvanized pipe. Imagine being only able to work with 90 degree angles and threading everything in. Your planning has to be on the money.