This is kind of like opening a can of worms.
Everyone has an opinion, which is good, but ....
I've got a Liberty, not a Wrangler. I have a Blue Ox base plate and Blue Ox Alpha tow bar. My braking system is courtesy of NSA Ready Brake. Rear light wiring is Hopkins. BlackJeep22
both have Wranglers, I believe, as do several others. I'm sure they will jump in here soon to expound upon the virtues of their set-ups.
One thing, though, If you are looking to go with a surge type brake, I believe there was a Ready Brute Elite for sale by a forum member, I just can't find it right now.