your height is irrelevent to determining board length and so that is one less variable to worry yourself about.
boot size can result in over hang, but as Romeaz says, size 10 shouldn't give you much bother. even if both your feet were bound at zero degrees.
but if you insist that there is cause for concern, look into a board that has inbuilt risers. or buy some aftermarket risers; these are plates of plastic that go between your binder base and board top sheet, thus giving more room between your boot toe / heel and the floor thus removing foot drag.
with this sorted, you can go get the board of ideal length. easy peasy!