I've had and used a Martin O-16 NY since 1974 and don't think I'd part with it for anything. Except maybe an O-17. They're just superb finger picking guitars. You would have to get used to a slightly wider neck though. I always have trouble making adjustments to the narrower necked Dreadnought models. The strings aren't where my fingers want 'em to be either on the fret board or the picking end.
I bought a big old Guild to play when I was with the Powdered Eagle String Band. It punched out a nice bass but wasn't much louder than the Martin and the treble didn't come through nearly as clearly. Also remember, when you using amplification, you don't need a boomer.