didn't buy it yet. was looking for an answer before. I'm planning to buy a Panasonic TH-42PX60. I think i found the answer, a Monster cable HDMI to DVI and plug it to my PowerMac G5...
FWIW, while the TH-42PX60 is 42", it's only 1024x768.
I have no idea if they're available around you, but I bought a 37" Westinghouse (nicer versions are available, but mine - the LVM-37w1 - is only US$1499 at Best Buy). 1920x1080. Beautiful picture. Works perfectly with my mini duo's DVI output.
Techinically yes, but in practice they'll look the same unless you're running a 10'+ VGA cable (then lookup Google for more info). If anything, you may run into overscan issues with HDMI that you won't with VGA.
I was using VGA on my 30" HD LCD Olevia, and it would auto-resize, and it looked great.