If Denver cnc was partially to blame and led you in this direction, maybe they can help you out. I'm assuming they are the dealer you are referring to. I know the last time I talked to Denver they were working on a new controller rated at higher amperage, I believe they would be using geckos. I would definately talk to them first, maybe they can take in you old box and set you up with a gecko system, as a side not Denver is presently using Xylotex boards in their controllers. If Denver does not work out for you I would try camtronics. They use gecko drives and if you send them the motors you are going to use they can test your set up before shipping, Good luck.