heya
I also bought 4 of these motors check my profile for what I was going to use them for. I have done lots of reasearch and sadly I am a bit limited on what I can actually use these motors on.
First off the motors move quicker in one direction then the other. No one gave a definate answer on how to correct this so I just turned one of the motors around and used that side.
As for controllers I origanally wanted to run the motors on 24volts. However if you double the voltage you quadruple the watts. This would ressult in huge current draw. I would need a controller to hand 3.2kw which is not going to happen. Some people have blown sidewinders even just running one motor on 24volts.
So I was just going to run the motors on 12volts.
However there are few controllers out there which actually run on 12volts. Wotty and sidewinder are both 18volts.
Only the robot solutions rs80d would be close and of course 4qd 12volt ones. Though I had issues modding a 24volt one to go to 12volts
However I had a linear actuator in the robot which needed to be ran at 24volts or I have a super slow weak weapon. after all this hassle I have just decided to get some bosch 750.

I am going to put one of these in a feather at crank it up to 24 volts and use it as an axe on bang bang controlle.

I do however have one last test which is to try and run a single 400watt on a modded electronize 40amp controller. Il let you know how that goes.

Another option is to try and run them on those crazy no limit tiny racing car speed controllers. Which suposidly can handle 400 amps. However nobody has any experience with them and I have my doubts. The wiring is tiny and it uses those racing car conectors. Which fuse together when 30 amps is passed through it. Wouldnt like to see it at 400!

Sorry to put a bit of a downer on you plans.