Hey Kraeuterbutter :)

I think you are right. Initially I'll be getting 16T, 20T, and 24T pinions for my conversion. This will allow me to adjust top speed between 30 and 50 MPH depending on desire. I think with 16T for track racing your 1000-1200W prediction will be correct.

2100 cells are the smallest I will use. I chose the 2100s for low weight and their dimensions that should fit my chassis like a glove. I might increase to 3000 or 4000 mAh later.

I think 50 MPH will be the highest speed I attempt. :)