What BEC to use for MMP 1S version?

[simplechamp]

So basically I can either set the LVC at 5V (which would rob me of some run time, would have to test to see how much) or get a 1S boost module? How about a Castle 1S boost module Patrick to go with the 1S MMP?

EDIT: I found this http://www.dimensionengineering.com/lvboost.htm but the max input is 5V