call dynamic,ptc and ultimate converters and get one built to your combo and intended use. you won't be sorry. it may give ya some sticker shock but it will be well worth it.. when talking with them be 100% honest about your combination and intended use. if you are not you won't be happy with the converter.
i've heard nothing but good things about the three companies i have listed. i have personally used a dynamic and the thing was incredible.
http://dynamicconverters.com/
http://www.ptcrace.com/
http://www.ultimateconverter.com/