I just bought a Klim gore-tex altitude jacket and love it but it does not have a liner to keep you warm. Im thinking of getting the FirstGear heated jacket liner and was not sure which one to go with, the 90 watt or 70 watt. Also, I ride solo and was wondering which controller should I get? My gloves keep me warm so I will probally only be plugging in the jacket liner. Is the controller hard to install and where have you mounted your pigtail? Thanks for the help!