[suicideneil]

Thats the one thats been making my brain hurt- you either have to choose 2000kv which I think is a little high for 5s lipo, or 1600kv which I think may be a little low for 5s, and definately too low for 4s really. I would however go for the 1600kv 80mm motor on 5s lipo as the bigger motor can pull taller gearing to get you your desired speed, just means you need good batteries for the higher load.

Thats the theory anway....