I second Music Man's notion of not extracting the teeth.
My sister just got Invisalign to move her teeth slightly back to where they were before the wisdom teeth moved them. Also 3 of her wisdom teeth erupte perfectly but a 4th was below the gum. The oral surgeon put a bracket on it and now is pulling it up using the invisalign. If there is anyway to safe wisdom teeth it is a great idea becasue they might be the only teeth you have one day. They are cute teeth.
At the very least don't remove them if you don't have to because it could mess with your body's equilibrium.