I was wondering if someone could educate me on how to get into the Mac pro scene. I have a 27in Thunderbolt Display hooked up to a MacBook Pro right now. Only video editing I do is on Imovie for family stuff. Won't and can't spend 3,000 on something I just want to dip my toes into. So I want something used that is expandable and can tolerate 16gb of ram. Also I am not a heavy gamer. Any help to this rookie would be appreciated.