I'm not encouraging you to leave either, but your query raised my own curiosity...so I did a quick search with some of your parameters. Thus, I can't speak for the quality of these, but here's what I came across:

Christian guitar forum
Acoustic guitar forum (this looks awfully familiar :) )
bluegrass forum
Steel guitar forum (though not specifically for typical hand held guitar, it was a top result)

None of these may not be "the one" you're looking for, but take from each what you will. Admittedly, that's what I do here as well, being that I visit several forums of interest.