Glad you found a doc at UPMC. From what I know, Dr. Gardner only does surgery and will not recommend other viable treatments.
Dr. Lunsford is also at UPMC; he specializes in Gamma Knife. To my knowledge, they do not consult each other so if you want to consider GK, you need to request they send your CD over to him. There are similar posts on this.
If you need more info, PM me.