I think alot depends on what your objectives are. If you want to improve your odds for winning a match, there is no substitute for wing span. If you want to fly a slightly slower and more controlled version of combat, go with .15s for power and see how you like that action. I have seen club style combat with 3.5 to 6 pound, .25-.40 powered spads flopping around out there and 90% of the streamer picks are just blind luck, random chance. Half of the time the pilots don't even see the transfer right away. The action is too fast and it eats up too much ground for there to be very much following through the manuevers. It is more like watching demolition derby. Those planes are simple and cheap to build, but when it comes to combat, those planes give back about what you worked and paid for.