4s or 5s or 6s?

[magman]

well w/the 2200 motor on 5s will be a lot faster....but if you really wanted an efficient set up, a 1500kv on 5s would be much better and would should give you a couple of extra minutes of run time if geared correctly.

I believe you can now get 5500 and 6000mah 5 and 6s li-po. The more mah, the more weight you add though.