I just bought a HV20 today for personal use and some limited corporate location shooting.
I would note the HG10 is not like the HV20 as far as AVCHD -vs- HDV and their inherent editing support options. While I love the newer AVCHD codec based cameras, they are a pain in the butt to work with as far editing in Final Cut Pro. Editing under windows offers a better workflow.
I would also note Cineform offers a realtime telecine pulldown support for the HV20 under windows, which is also a real nice work flow advantage. I'll be looking into running Cineform on My MacPro under Parallels.
The HV30 is due out sometime this month and I believe 30P support and a black exterior are the only real differences. I needed to buy my camera now, so I don't have the luxury of waiting.
If I were able to wait a little longer, there a bunch of new cameras coming out in time for NAB.
edit... I would also note manual mode support is not a strong suit for the HV20. A good manual support HD camcorder is the older Sony HC1, but it doesn't do 24p. You might have to move up in price and size to start to get into the kind of manual controls I think you mean.
Anyway... every camcorder has a list of pro/cons, however at the current discounted price, the HV20 is pretty compelling rig.