My vote is for PTC. Oops Pontiacdude already said that, my bad
Seriously, I have had good luck with PTC and their customer service is really good. I had an issue pushing through the 9.5" so they upgraded me to a 10" pro-mod style for no charge. No complaints at all from me.
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Brand X A-body, twin turbo 540 running e-85, 1455rwhp @ 25psi, 8.66@166 on 20psi, 4000+lbs, 3.25 gears, thru tailpipes and on radials.
Wifes car: 70 gto, waiting for me to build a single turbo 467
Dad's car: 68 gto conv. 12 to 1 455 on e-85