Hi,
If you need low price, i found / use this kind of PS : http://elc.fr/en/online-quotation/adjustable-and-multiple-power-supplies/100-power-supply-32v-20a-640w.html
His streng is that you can control in many ways (USB //modbus // analog ) and it can be reeuse for other projects.
There is also a double output PS with same design.
The LV drivers seems fine (not used yet)
Regards