Best vendor for 72 K10 rear disc upgrade kit

[Lugnutt]

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