There's no real diff in pricing between KC and Malcolm...
If I understand it correctly,
$40 setup = adjusting trussrod, saddle height, intonation
This will certainly help lower the action if it's high, but if the buzzing is due to an improperly cut nut, or high/low frets, then no amount of tweaking will get you real low action.
This is something pretty much any one of us can do with an allen key, some time, and plenty of patience.
$130 setup = all the above + nut filing, fret leveling
Assuming your neck is in good shape, this setup will get you your super low, dream like action.
Cutting the nut and fret leveling is something that you'd be better off leaving it in the hands of a more experienced luthier/guitar tech.
So you're essentially paying an extra $90 for the more detailed work and expertise that may (and usually is) be required for a great setup... which KC will charge you as well if you want to go the whole hog.
IMO, I'd save myself the $40 and do the basic setup myself. If that doesn't solve the problem, then I'll spend the other $90 fixing it.