14awg will be plenty, but I usually go 1 awg larger than I need. It leaves room for upgrading. www.knukonceptz.com has some of the ebst prices you are going to find. Easy way to find out how much you need is take some string or yeard and run that along the same route you plan to run your wires, then measure. Always leave yourself a couple extra feet though. Nothing worse than running a 12ft piece of wire, only to be 2" too short and needing to go back out and get a 13ft peice.