I have a self imposed limit of $150 (not including shipping) for any knife and I have gone slightly over several times and one time by a whole lot (that knife was later sold).
This limit prevents me from pretty much anything Busse and I really want an AD. I may end up selling a few lesser knives to get an AD. With kids and my wife who stays at home with them, it's tough to justify much more since I have a firearms, hiking and Jeep hobby/addiction as well.