Moon already gave you some great advice. She's really become well educated on this guitar sound business!(:<))Everybody will tell you just about the same and the above posts are all to the point. In most cases a rosewood dreadnought gets you there. If you have a good strong personality and intend on playing amongst the serious Bluegrass folks, buy what you like. If you're not a real strong personality type.....buy a Martin.
But as Moon said, play 'em all so you never feel bad about your choice.
Spaw