Best vendor for 72 K10 rear disc upgrade kit
 

I'm looking to upgrade my stock 72 Chevy short bed stepside 4x4 rear brakes from drums to disc. I'm also running deep 15" Eagle aluminum wheels w/ 33x12.50 tires so that's a limitation of space for the calipers. I'm not looking to salvage parts from the wrecking yard, I'd like to purchase a kit from a good parts vendor. So far I see Brothers has a kit and Summit also. I'm sure there are other vendors and I'm sure there is a kit that many of you would say is "best" kit for the money. Could I get your recommendations on the best kit and who sells it. I'm seeing that these kits do not include a proportioning valve so I guess I'll need that too.

Also I've heard someone (can't remember who/where) say that I might possibly be able to boost my power brakes by installing a 3/4 or 1 ton booster. Is that an option?

I very much appreciate your input