The LA is a bushing type engine and costs half of what the AX costs and has plenty of power for the trainer and is very reliable and just as well made. You probably will keep the trainer and either sell it later as a package or continue to learn from it periodically. Mine is used for training and fun fly bomb drops etc now and flies almost weekly although I have several other planes and engines. Go LA.46 and then buy a ST.46 for the next step.