My converter was $750 when I got it and another $200 for installation. It was the best money I ever spent. Worth every penny.
When I would be cruising at 1500 rpm or so, I could stab the gas and the rpm's would jump to 3000 almost instantly. If you are having trouble getting into the powerband, a converter (no matter what brand) will help
ALOT 
Good luck with whatever you decide!
