The only thing I can say about B&M and TCI is they may give you the stall you want but they probably aren't going to be as strong as the other big name race converter companies and another thing to think about is torque multiplication. A B&M and TCI only have around 1.8-2.0 and the PI has 2.8 pretty big diff if you run some numbers. There is a guy that works for Emerald Torque converters that builds customs ones. I got a C4 converter with 3000-3200 stall 2.8 multiplication and built to hand Nitrous and transbrake for $565 to my door.
------------------
88LX 5.0,C4,BBK LT's, Race magnum bullets, K&N, ASP 3" Crank pulley, 3.73's, ram air, air bag, skinnies, battery in the hatch, 75hp NOS Dry Kit, Explorer intake
8.10@84 N/A 1/8th T-5
7.61@89 N2O 1/8th T-5
http://www.angelfire.com/ns/PurgingPony/50mainpage.html