My favorites are All-Star Vela/System7 and Wilson ProMotion. Unfortunately, the Wilson ProMotion is out of production, but you might be able to find vendors with pieces available. The new Easton gear looks interesting, but I haven't had a chance to take a closer look. Historically, I haven't liked Easton's gear very much. I'm not a big fan of Mizuno.
UA gear is made by All-Star, and is a solid choice for a "set".
Currently, my kid is wearing All-Star System 7 legs, Wilson ProMo chest, and Wilson Shock FX-2.0 helmet. We are in the market for a new helmet.
This is what we got my "normal" sized 10U catcher last winter and couldn't be happier....
Wilson Maxmotion chest guard in 14" sized.
Wilson MaxMotion leg guards 13" sized.
All-Star Catchers youth helmet youth sized.
We got all in cardinal red and all matched very well. You could likely do the same in Navy, black, or Royal blue. I couldn't be happier with the quality of this set, and we have less than $150 invested.