Lostcoast,
I would just keep my eyes open for a green ghost female of at least a 100% het GG. If you invest 2 years into a 66% that dont prove out now you are farther away from your ultimate goal. Take your time and look around. I personally would not waste my time on 66% unless I was looking at an expensive recessive or adding to a group I already had. Just my opinion but then again I am impatient! Good luck