What are you going to be doing with it? Running, going to the gym?
I agree UA is my favorite clothing, but also about the most expensive. I've got a mixture of everything. My opinion is Nike isn't worth the money because I've never liked it as much as UA and it's the same price - or more. I've got Adidas, reebok, and a few random brands I've gotten off the clearance rack. They honestly all work pretty good. Some of my favorites to wear were the cheapest. But UA never disappoints.
Sizing is never consistent even within the same brand. So always try it on before you buy it.
Balega and Darn Tough socks are hard to beat. Expensive for a pair of socks but well worth it.
Shoes - go try out different types and see what you like. Everyone has a favorite brand. I like asics and mizuno, but that's just about all I've ever tried. A lot of people like brooks, Nike, and saucony. And then there are a lot of lesser known brands that make great shoes - Altra, hoka, and even Skechers is making some good shoes.
Same goes with clothes - you can find a lot of high quality, lesser known brands that are probably only available in a running / cycling store.
I buy most of my clothes at Dicks. Academy doesn't seem to have as much variety in the name brands. And my local running store is damn expensive. I buy most of my shoes online.