John - for the reasons you suggest (load regulation/mains variation), I went with a 2x45V transformer with the secondaries wired in parallel. I used a 625VA Vigortronics toroidal from Rapid Online. You could get the other components from Rapid as well and maybe get free postage. I'm using EM806 drives that are good for max of 80V and nothing's gone pop yet!

Judy a thought.