berin - maybe 2 tracks - one for the DIYer that wants to build from scratch - and then another something simple - like "off the shelf" or as you suggest using a pc supply.
I'm pretty much in the basic electronics category [even got to take EE over in summer school - shoulda paid better attention and not cut class - ahhhh the 60s were something else!!!!]
Guess it makes a difference which motor it would be mated to, and controller (board) -- right? Amybe we should get a survey (spreadsheet - or whatever) of the "typical" motors and their power requirement to help bound the solution set? Any volunteers - sorry I have not gotten much response on my survey attempt - else I post those results for us to start with.
Good start up - thanks! Jim