We might take a look at something like that. The minions are interesting chips in a lot of ways. A lot of the basic design is done, so while it wouldn't be a dead simple port like Avalon Gen1 to Gen2, it would be a similar interface and setup to the BFL chips.

Regarding the power supply, I just buy a few of these.
http://www.digikey.ca/product-detail/en/39-01-2241/WM1029-ND/284603
http://www.digikey.ca/product-detail/en/0039000081/WM1016CT-ND/3028731

They're the 24 pin connector you'd see on your motherboard. You just need to crimp two terminals together on a piece of wire, and put them in the right holes on the housing. I like them because I can also pull out the two 12V lines on that 24 pin ATX connector and use them to make another PCIe connector. It's really useful if you have a bunch of supplies with 4 rails that only have two rails feeding onto PCIe connectors by default.