Read Johns post about his SK and the .35. I have seen several of these planes with a .46 and the .46 had gobs of extra power. I once flew a glassed and painted 40 size Supersportster with a .46la, it flew the plane but there was no OS factor at all in it. That was a very heavy plane I bought at auction. There is still a big difference between flying the plane and getting it off the ground. If I have to dive a plane to do a tight loop then it is under powered. The OP is looking for good performance. That is an opened term but a good .46 should do it in most cases. I look at good performance as being able to pull a plane from straight and level flight at half throttle and being able to roll power on as needed to perform a giant sky filling loop. I'm talking a big loop, not a tight little over the top loop after a dive.
This brings up the question for other pilots. How do you look at enough performance. I fly a very nice basic known pattern sequence with a 2 meter patterrn plane with a YS 1.20 engine. The plane should be running a bigger engine due to it's weight but it does everything I want and is really smooth. I feel it has very good performance.