I have bought some decent bib shorts and jerseys from Performance over the last 15 years. Mostly their house brand some and some Pearl Izumi. I really like the insert in the house brand Elite II bib. I like a plain colored cycling jersey and they have those. Rear pockets are great for bananas, spare water bottles, jacket storage. The longer tail can cover plumberbutt if you are wearing non- bib shorts.
I've read a lot of positive things in the Road Cycling forum about Assos, Castelli, etc. and I'm sure that they are quality products. When I go over three hours in saddle it's my legs and back that hurt more than my posterior so the extra money for the high end stuff isn't justified to me.