I have a 1975 Guild F40 that I bought new so I have the sucker for 30 years, BUT, I rarely play acoustic anymore so it is not my #1.
My Nash made warmoth Tele that I have had for 3 years is still my #1. It was displaced by my Newport for a short time but I keep going back. Why? It is basic, simple, no frills, and I can get a lot out of it. The only thing different about it is the Korina body. Overall it is very reflective of my personality.
The only other piece I own that I have for more than 3 years is a Marshall 2x12 Cab with 75 Watt Celestions that I bought when I started playing again back in 1993.
I'm a gear slut.