er.......um, isn't this a little like asking what your favorite shoe is? It depends on whether you're going backpacking, running, or dancing. A few of my all time favorites-1922 Martin 2-17-sounds like church bells in a small chapel. Clear, bell tones,beautiful! 1935 Naional Trojan-very plunky, percussive mid-range like a combination of banjo, guitar, and piano. 1938 Regal parlor guitar-cheapest wood in the world painted grain(!) but balanced between the bass and top end like you wouldn't believe and loud as thunderstorm. 1996 Martin DM-18-another well balanced guitar. Nothing exotic, but durable and versatile as hell with amazing dynamic range and plenty of separation and definition. I could go on and on...............