>>322752373
There is not a booth model for everyone. Your best bet is to buy one you like, then edit it to look like you want it. Learn Blender and Unity.

Fyi, there will soon be an "Avatar Museum" world like mid februari. Like 100+ booth models you can try out to find one you like, and that work well in FBT if you have that.
I would hold off buying a booth, and play around with mmd models in Blender and Unity until then. Also a good way to find an avatar style you like.