IF you want to go for a 4* then get the 60 size. Reason, better visibility because of larger size. Its much easier to see the orientation of high wing planes than low wing planes because you can see the fuselage sticking out the bottom. When a low wing plane gets out a distance sometimes all you can see is the edge of the wing which just looks like a line in the sky. If its not a contrasting color from the sky, you can lose it! Thats why I like to have some Neon Yellow stripes on each wing. It picks up the sun light and reflects back like a beacon, can't miss it! Based on what you told us, I would also buddy box the 4* for while. It will fly much faster than the Cub and react faster. Good news, the 4* planes have a very wide speed range and besides being fast at high throttle it will also putt around the sky very slowly at very low throttle settings and remain very controllable as long as you remember to throttle back. To be honest though, it sounds like you should stick with your trainer a while longer. You don't want to be guessing about orientaion on faster flying planes. [8D]