Bill is (as usual) spot on.
You are a prime candidate for a G50 conversion and IMHO, it will be a lot cheaper in the long run with the kind of power you will have.
The G50/50 is VERY expensive and the most rugged, durable 5-speed they ever made but its not for the faint of heart (or wallet) now.
The very first question I always ask my customers is, "What is your budget" as that answer really frames what one does,...