Good story Mark. I do think after 2 years you mastered the trainer to the fullest. It is good that you were able to handle the extra 300. I wouldn't recommend that to someone who hasn't been flying as long as you have. The Sig Four star is available as a Kit or an Arf. It all depends on if you want to build/modify the Four Star or just put it together in it's original form. Everyone is different in this hobby, some catch on quickly and some take longer. These rules mentioned are in the general sense of speaking. They don't apply to everyone the same. For instance, I learned quickly and now I am a certified AMA instructor for my club out of 100+ members. I agree with your statement, "For the most part if you believe you are ready for that second plane go for it., but I have seen many students who thought they were ready and ended up destroying a brand new plane because they were impatient and got a little cocky because they could take off and land a trainer. I think if others and your instructor say it, then you probably are ready, but wait for others to verify your thoughts before jumping boat.