I can only recommend this Cap 10B, it is light, very well built and flies extremely well. I power mine with a 160FT, plenty for scalelike aerobatics. It's not a 3D machine, but if you really want to wring it out I guess a 160 2-stroke or upto 220 4-stroke would be ok.
I beefed up the undercarriage which flexed too much, and did the usual strengthening of firewall and most wood joints with thin CA. The covering is excellent, and I regard this model as a bargain.
Richard B.