Hi, Scott. At the present time, the only ENGL amp that is modeled in the Axe-Fx is the Powerball. Having never played the real deal, I can't speak to the accuracy of the Axe-Fx model. But I can tell you that I do happen to like the sound of that particular sim quite a bit. The other thing that I would suggest to you is this; don't get too hung up on the level of accuracy of any given amp sim. There are quite a few that will do their namesake's tones to where you'd be hard pressed to find someone who could tell you which is which if you A/Bd them. Others, not so much. The thing you truly need to know is that just because the Axe-Fx doesn't have a sim of your favorite amp, does not mean that you can't get those tones from another amp sim that IS inside this amazing black box. Start with a sim that is tonally similar to what you're looking for and then start playing with all the goodies. (EQ, Drive blocks, Filters, Cab sims, Mic sims, etc.) Chances are you will either meet or exceed your original expectations of the tone you were trying to achieve. Take the plunge, man. It's worth every last penny!
P.S. Just because the Savage 120, Invader, or the Special Edition isn't modeled yet, that doesn't mean that they won't be modeled in the future. And if they are, Santa Claus, (he goes by the alias "Cliff Chase") will give them to you for.....wait for it.............FREE!!!!! Pretty freakin' sweet, eh?