PTC is who I went with. Before I ordered, I called 3 different converter builders and PTC was the only one that gave me the time of day so they earned my business. If that wasn't enough, they took the time to go over my build specs prior to recommending the right converter for the combo. Took payment and in 1 weeks time, the converter showed up. Keep in mind, I am in Washington State which is the opposite corner of the country from PTC.
Great products and customer service goes a long way in my book.