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Like eheath said, you're comparing two pretty different things, and he laid them out pretty well for you.
If you asked me, I'd take the DVX. Part of the fun in video is the filming, and filming entails messing with the camera, adjusting the picture. You can't do that on an HV30 the way you can on a DVX, there is no way. The DVX was built to be the most adjustable (is that a word?) SD consumer camera made at the time, and it was. It still is. I love my DVX; I love what I can do with it, I love what it does for me.
Plus it has a handle, and TWO ZOOM TOGGLES!!1!lol.