Just a couple thoughts on the topic (ran out of smart remarks, I guess): Different types of guitars can produce drastically different types of sound--Taylor guitars seem to have a real special ring--reminiscent of the old Gibson J-200, but more affordable--The booming bass notes on those Martin Dreadnaughts has been mentioned before, and I will add that with a bit of palm-damping, you can do some mightly nice Chet/Merle fingerpicking on them, and, though not much regarded by the guitar collectors, the 70's models are great for playing rhythm for Jazz and such things--

Biggest problem that acoustic guitars seem to have is that, in closed positions, even very good ones don't produce the kind of clean, ringing chord sound that you can get with say a Les Paul or and of the arch top electrics, and forget about being able to do solid melody or solo work--

John Zeidler's guitars, particularly his archtops, are designed to do this, and they sound great, but they are a lot of work to play,, and ungodly expensive--