I may just toss the current set-up in my stampede or RS4 and bash with 6 cells.
I have the funds for the MM4600 so I think I'll just go for it. From what I have read here on the forum the 4600 sounds like a better choice than the 5700 since I'm running 12 cells.
Any suggestions on where to buy a UBEC? I would assume I should use on with 12 cells.