I use the red one PART NUMBER: 10255- w/Power Panel shown at the bottom of the page.
I use a motorcycle battery that fits inside the starter. The power panel is great. It will show you how much power you have in the bat. As well as give you a place to plug in a glow plug warmer. Awesome power and it has never failed to start my truck.
I will tell you one NOT to get. the GS racing box is a complete piece of crap!! I just ordered the same exact box Fasteddy has from Tower. Can't wait till it comes