I did have headers for the longest time but had to many issues with the flanges. So ended up going back to stock manifolds.
Also if you did get into plumbing. It has different areas to offer. Service, commercial, installs and sewers. Each having there own pluses and minuses.
Tahoe and Yukon are nice my dad has one. I just for some reason grew up loving the suburban more lol. But having a truck is also something i could see having it's own benefits and more practical for life style. I never owned a silverado but my friend has a 2door Cheyenne that is pretty awesome. I really wish I could purchase a crew cab dually with a 7.4 but I have no need for it lol