Well, let me speak blasphemy here. I have never really been a fan of Martin Guitars. And this is mostly due to my style of playing. I do a lot of fingerpicking--blues, ragtime, and pattern-picking sometimes called alternating bass. The Martin D models and the J models just have way too much bass for that sort of playing. What I have been playing for the last twenty-five years is a Stuart Mossman Tennessee Flattop. It has the body size of a Martin D series but with its mahogany back and sides, and spruce top, it sounds wonderful when played fingerstyle. Its drawback is that it doesn't have the bottom end for playing rhythm in a bluegrass or old-time stringband setting. But that's fine with me. I got lucky. This guitar was built in 1976 after the Mossman factory fire, but before he sold out to Conn Instruments. I don't think I would part with this guitar ever.
Jim