hey mooh!, I play ONLY GDAD on my bouzouki, If you haven't tried it, give it a go, it's lovely!. It's comparable to DADGAD on guitar.
I disagree about open tunings being 'limited', they are only as limited as your willingness to experiment, (and travel up the neck) might (or might not)be.
It was a bit frustrating coming from 12 years of mando to this tuning, more of a stretch for anything high,,,however I love the sound of the long slide to the high notes (not that you have to slide, I'm not lazy, I just like it).
anyway, sorry for interrupting the guitar gabble with bouzouki babble
muh