Which do you want the easy route or the hard route? Easy would be the multi add on, since you need to learn some very basic maneuvers and a couple hours of ground. The hard route is a challenge, but a lot of fun, you get to learn how to teach somebody how to fly. Plus you get paid by the hour, which adds up to pay off any other remaining licenses. Get you're multi and it's a lot of sitting around dreaming about flying.