Forgot about the Evolution, but the price is more than the TT, plus the ability to tune the engine is a double edged sword. Good, because for newbies it doesn't allow them to stray outside of the engines comfort zone. Bad, because the band for tuning is small. On power, I would say that the AX and TT have a little more power than the Evolution. Add it to your list

Evolution .46NT $89.99
http://www.horizonhobby.com/Shop/ByC...rodID=EVOE0460

My list would be

1) TT.46
2) Evolution .46NT
3) OS .46 AX
4) OS .46 LA


Lee