alternate idea for High Voltage servo power supply

Maybe this is a stupid idea, but I thought I'd field the question
anyway...

I'm looking to use some G320's to drive my servos. The motors I have
are actually rated 120v, but I'm fine running them at around the 80v
limit of the G320. I've already built a pair of conventional 36v DC
power supplies which run the servos fine when connected in series
(giving around 72v), but I was wondering about a different approach.

What if you use a solid state variable DC supply like:
http://www.surpluscenter.com/item.asp?
UID=2003111416550838&item=15-1074&catname=electric

Perhaps putting on a big cap to handle surge load requirements. I was
thinking this would be a lightweight, compact high voltage supply.
Just stick it in a box, dial in the voltage, and hide it away.

What do you think?