200W PSU can easily run the BPPC + BVision + 6 HDDs etc, as long as you feed extra power thru the floppy connector. This is the recommendation of the manufacturer, aswell. This is what I did for years, and no ill effects. Naturally YMMV.
IMO it's just waste of money to get some huge PSU for miggy, it doesn't eat that much.
PS. My system would not work reliably without the extra power cable connected to the floppy connector, regardless of the size of the PSU. AFAIK the problem was that the motherboard could not pass along enough juice thru the expansion-slot to run BPPC + BVision combo.
PPS. Naturally it's a different ballpark if there's some busboard involved (with a power connector).