i would look at a AOD aswell, it will give you a mech lock on over drive for street duties and still handle nines (800hp) (quick look on TCI, B&M and LenTech will confirm) all day long. Can race glides build decent AOD's as they are pretty specialised trannies? after speaking to a few Trans building companies in the states the AOD is the obvious choice for a tough street car with friday night drag action in mind.
Im currentley building a combo atm that will make around 360rwkw through a C4 (now an AOD) 5500rpm stall its running 3.55 gearing, so around 1600-1800rpm @ highway speeds depending on final tyre hieght choice.
Disregard the whole lot above if your car is not regulary street driven
ps i prefer to tune the car firs twith a stock stall (or up to 2500), then dial it in with the race converter...... tuning anything with decent power and a stall speed over 5000rpm can be a night mare.