On second thought, shoulder length might work well for you, especially since you take care of it and keep it neatly brushed and trimmed and stuff. It would probably make you look younger and more "cute," which may or may not be what you want. I wouldn't do it if I were you, but then, I like looking older.

I still think your current look, or maybe a little bit shorter, is best.

And I can second DHR. I only went once, but he was very helpful and friendly, even though I ended up not liking what we ended up deciding to try that time - but I tried going back recently. Warning - book early. Walk-ins just don't work; they're busy.