headgear for sure! maybe even double facebows if i was feeling evil 

Double facebows would be so incredible to be strapped tightly into. Good choice

High pull headgear

Hmm, with only one additional appliance I would definitely opt for the Herbst Appliance (with expanders) again. Had it, hated it but also loved it at the same time. 

To begin with, I'd love to spend some time with an activator. After that, I'd like to get full bands, expanders on both jaws, and a tongue crib tahtd make speaking very hard. I'd also love a Herbst appliance thar causes visible lumps even if my mouth is closed, springs, heavy colourful elastics, lip bumpers and high pull headgear.

That would be a dream treatment!

I’d choose fixed braces with a large removable twinblock appliance in that translucent pink gum colour for my girlfriend. The plastic blocks would obstruct her tongue causing a significant lisp and I’d love to see the way it forces her lower jaw awkwardly forward and open a few centimetres. I’d enjoy watching her struggle to close her lips over her bracketed teeth and listen as she attempts to relearn how to speak with all the plastic covering the inside of her mouth.

Well... I have top and bottom braces with black power chains right now but I really dream about herbst appliance with double expanders and tongue crib! It will give me amazing lisp!!!! After one year I would also love to get a headgear!

If I had to choose only one appliance it would be a tongue crib. I've been wearing one as part of my fake braces for nearly six months and it feels fantastic. Of course I like my other appliances too but there is something special about the tongue crib.

On the rare occasions when someone notices that there is something extra behind my braces, it makes an interesting conversation starter.