I love COMP-N-CHOKE.

I have one on my BPS and I will put it up against anything that isn't 100% custom made. Not saying that b/c its MY gun. If it was my friends, I would still bet on it. The combo I use with my BPS is amazing.

A lot of people like KICKS, its a sister company to COMP-N-CHOKE.
The Star DOT is an awesome choke for the money.

The KEY THING to remember is that every choke and load combo is going to pattern different on EVERY gun. So, most of it is trial and error unless you send it to somewhere like NITRO.