If I can lead the OP to a used 640P with a P100, or at least share my thoughts generally about the thing, I've helped make the world a better place in spite of the efforts of pretentious and condescending context police attempting to crawl up my wazoo.
Again, give up your ad hominem rambling; only a child takes offense when his toy is criticized. The OP doesn't want a 640 as he already has a 651; what he wants is an enhanced power supply, and I am the only one in the thread that made a viable suggestion. To wit to call Dusty Vawter at Channel Islands audio who will, in all likelyhood make one for the OP.
If you can use a soldering iron you could consider this: http://www.kandkaudio.com/accessories.html. The LT3080 is an excellent regulator chip and the use of soft recovery diodes reduce the "hash" generated by the supply.
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