lango: I'd certainly sell at least half if it were $80 today, or tomorrow, or next week, or next month.
I rebuilt a position twice a big as I usually do, just for this purpose: take profits if/when hits 80s... depending on circumstances at the time, I will either sell a portion or all of the new position (ave. cost = $54.50), but the tentative plan is to sell half and keep half through Q1 or Q2 (calendar) of next year.
Jim