Excellent! I decided to use 70V because I went with the AM882 drives. So it seems I will go ahead and order the parts for the power supply this weekend!

There will be 4 motors driven by it first, but hopefully a 4th axis will be operational after a while.

So will a 625VA be enough to supply 5 motors? My calculation is as follows:

625/50=12.5A

4.2A ea motor * 5 = 20A. Assume I need only supply 60% of the power needed: 0.6 * 20A = 12A