Hi, new DIY. Would like some info about shower valves. I've torn out a fiberglass tub/shower and changing to walk in shower. I'm going to change from two handle control to a one handle control. There are a lot of brands and styles to choose from. I need some help in making a choice. The new plumbing will be copper pipe. The house is about 35 years old. I've heard and read so many pro's and con's about makes and models of valves, maybe just close my eyes and grab.