If you can stretch that to $800, get a Breedlove Atlas series.
I'm amazed every time I play one.
I'm very happy with my $450 Dean Exotica, though, as well, and I wouldn't have any reservations about suggestion that (It's a QSE, which is quilted maple back and sides, and a spruce top. Mahogany neck).
You can actually hear that guitar (mic'd) on any of my songs at my myspace, to give you an idea.
Other than that, maybe try to find a used Taylor, or maybe even some guy getting a divorce that needs to get rid of a nice Gibson before his wife snatches it (I'm kidding...) Craigslist is your friend lol.
Have fun hunting.
PS - some will suggest an Ovation, too
