I started off with a cheap Greek bouzouki which eventually fell to bits; I've still got the body and one day (perhaps) it'll get a new neck. Then an "Octave Mandola" (Baritone Mandolin, really) and more recently a cittern by Gerald Adams (Norwich); open tunings for me. Though I play mostly fiddle, now, I love the Bouzouki/cittern sound. Cittern (5-course) is probably a bit more versatile.
P.S. I mis-typed the URL. It should be: http://www.ice.el.utwente.nl/~han/bouzouki/index.html