RE: 25 size trainer
Great planes PT-20 is a goodie. A SIG Kadet Seniorita as well. The SIG LT-25 is hard to beat. That engine will do al of these with ease (OMG I did the rhymie ting LMAO). Good luck with whichever plane you choose.
Mark Shuman
PS: these are all kits and must be built.