[jnev]

Well after plugging in many values and playing with BrianG's calculator for a long time, it seems that the 1515/2.5d will be the most versatile, in terms of voltage being able to run and gearing.

Now I have to decide whether to run 5s or 6s... I can gear up to run 5s, and reach about 40 - 42mph, or gear down on 6s and reach the same 40 - 42mph. Which do you guys think will be the most efficient or the worthwhile route to take? 5s of course is nice because the battery is a good $45 cheaper than a 6s pack, and I can keep my current 4s pack and still have speeds in the low to mid 30's without changing gearing... But the power with 6s will just be amazing...