To steer your decision tree on costs ..VersaTune is not really useful unless you buy the more expensive version. The free logging only is a good option. I started there and then went with the next step flashable tunes, but with the fact you want a larger turbo you will likely need the full package one. At that price point, a AP is really the same price. More tuners support AP so if you don't feel comfortable tuning yourself, and most people will recommend getting a AP because of that.