I'm look for a 3600 stall but not lookin to spend 700$ lookin more around that 500$ any ideas on good brands

 

I personally would choose ptc. However yank, vig, circle d are all top quality companies.
Billet covers getup in the price range, look for a non billet name brand converter. That should give you a quality converter in your price range, brand new.

Ptc will ship a brand new converter with a cooler to your door for 500-525$.