hey fellas, there's a ebay seller offering custom psu's for c64, i bought one, but won't have a chance to test for some time. but thought i'd share.
http://www.ebay.com/itm/COMMODORE-C64-64C-1541-1541II-1581-Custom-Replacement-Power-Supply-NEW-/290632724037?_trksid=p4340.m185&_trkparms=algo%3DSIC.NPJS%26its%3DI%26itu%3DUA%26otn%3D5%26pmod%3D300611297268%26ps%3D63%26clkid%3D4249645718421896243#ht_1104wt_887