Another 4wheel disc swap here, I have the same kit (basically) as Ed ^^
I paid ~$1800 for mine, all things considered. That's 2.5" dropped spindles included, as well as Hotchkis 2" F and 6"R dropped springs. The $1800 number was all of this, including shipping. The only thing it did not include was a power booster (if you want to run one) or a M/C. Pics in my GMC build thread.
The only thing I don't really care for on the McGaughys kit is the brake pad surface is not as big as the surface on the rotor.. so you lose a little brake efficiency. I'm looking right now for some kind of way to cross reference another brake pad to use with this caliper that might be a little larger and come closer to fully utilizing 'Big Brakes' and not wasting any of what this kit could truly be.
Wilwood and Baer make some SWEET stuff too, it just depends on the budget I guess.
My Pop and I took my GMC out the other day to Burnish' the brakes. Pop told me just roll along up to this redlight and push the brakes pretty good. I had to let off to keep him off of the dash / windshield. I'm telling you man .. the McGaughys kit will stand the truck on the front bumper. .. and it could be better ..
I cant imagine Wilwood / Baer .. or some of the more pricey stuff out there. I don't have enough GO to justify that much WHOA if you know what I mean.

Supercharged LS3 running Road Atlanta (?) I'd definitely look at bigger brakes that what I have on mine. Every day driver, stock discs would be more than you'd ever need. Occasional cones, messin around on a curvy mountain road .. the McGaughys stuff is awesome. I guess you get what you pay for.
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Chad
1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway*
1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold *
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1986 Silverado Short Fleet -
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1985 Silverado Short Fleet *Sold*
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2001 Jeep Cherokee XJ 4x4 - Lifted, Built
1992 Jeep Cherokee XJ 4x4 - Lifted
2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride)