I would say I have a similar case to yours however I have a gummy smile, underbite and a recessed maxilla, my lower jaw is completely fine. I'm a mouth breather and I can't breath through my nose, so this is probably the main reason I'm having the surgery. Since you've already fixed your deviated septum I'm assuming you can breath perfectly now? what other functional problems do you have? I guess for you it's just about if it's worth the money and if you're willing to go through a year of braces + long recovery from the surgery itself