Grand Prix or Charles Ancona!!!
the most basic that i sometimes use is the grand prix brand show jacket. when i'm doing a rated show i'd usually go for my charles ancona.
Ariat, Kerrits, and Tuffrider are good. But Kerrits is usually on the expensive side but they also are really good quality and the design they come up with are awesome.
I like Noel Asmar classic coats
My hunter coat is an Ariat and it's absolutely fantastic