That AX sure sounds heavy, a two stroke 25 engine shouldn't have to weight more than about 10oz.

My advice is to go with lightweight stuff all the way, i.e. 10 oz for the engine and keep the rest lightweight too. Magnum/ASP/SC .25 would be lighter and cheaper than an AX.
I haven't used those servos myself, but they do sound strong enough. Just keep the weight low and almost anything will fly...