ok first of all, the GL2 is a low end, mid range camera, if that makes any sense.
The Panasonic DVX is proabably the best 3CCD cam you can get that isn't HD.
I have a GL2 and I like it, but I would rather have a DVX. As for the DVC-30, it just looks kinda cheap. Yes it has a Leica lens, which blows the canon lens out of the water, but the whole handle thing, meeeeeeh.