I don't know the specs on the Minolta Power Supply, but you should be able to find them out, and if you can't find a Minolta power supply, you can make one -- and that might be cheaper. Yes, that's a different type of plug, but they do that to keep people from plugging it into household A/C -- which would "blow the thing up". There are lots of DIY ways to connect those plugs to whatever power supply you connect it to. One -- I'm not recommending this -- is to simply cut the plug off and connect the three bare wires.
I did the same thing for my Beseler Point Light Source. The Beseler power supply is even harder to find than the head, but I was able to find an appropriate AC/DC transformer from LIGHTECH for about $25. Then I used a standard, plastic, electrical box to house the transformer and the electrical wires to the standard darkroom timer.
As to the Nikkor 50mm 4.0 lens, it's a fine lens as long as you use it around f8 -- which you should do for any lens, for the best results. Others will trash it, saying get the much better f2.8 model. Some people love to spend other people's money. I say, give it a try. I bet you'll like it.