I bought a Cannondale 29" 16 speed trail bike last year at a PA wounded Warrior fund raiser. I would like to convert it to and E-bike with the mid drive system. I have another older trail bike I use also but the Cannondale is the one I want to convert. I will use it mostly to commute to work and back ( 15 miles one way with a couple fairly big hills ). What would be the best kit to buy for this conversion?