I have this monitor and asked wells the same questions. Here's what I was told:
The H0 model is designed for a wood cabinet and is setup for an unusual .7 volt video input; the M2 model is designed for a metal cabinet and is setup for a more typical 1-5 volt video input.
In other words, get the M2 model. It's what I bought, and it's what will work nativly with a pc and regular power. The measurements on the spec sheets seem to measure different things in a couple different places. I noticed this as well during my initial research.
When I ordered, no one had even heard of the thing and I pretty much went in blind. That said, I am happy with the purchase even though I haven't had a chance to do a lot of playing on my monitor as I haven't completed my cabinet yet.