only reason on your setup to not use the 6r80 is if you need a full blown transbrake
at mid 6's, the 6r80 will shine, and may even be quicker than the other options
with my supercharger (roush tvs) what would you recommend? my plan is to have it be a drag strip car. Plus if i gp with the 6r80 i have, i need to figure out if i need the ecu for my auto or is there an alternative around this where i dont have to mess with the ecu and a ton of that wiring.