If I had to only pick 1 out of my current tribe (which in and of itself would be a tough decision) I would have say my 1947 Martin OOO-21. My other two "favorites" are a 5 year old custom Martin D-42 and a 22 year old Martin M-38. I gravitate towards higher end Martins, although I owned a Collings OM3H which was exquisite. But it was sactificed for the '47 OOO-21, and I've never regretted that decision. A post war D-18 is on the horizon.