Yes the monitor max resolution is the only thing limiting which signal you can display natively on the commercial units. Since all my sources have tuners and I'm thinking of building a media computer with an HD OTA tuner, a tuner in the monitor is not the best use of my cash. The advantage of the commercial units is that the inputs are on installable modules. So you can purchase an input upgrade as the technology advances. The commercial units I was looking at accept modules that support all of the standard interfaces from discrete to HDMI
That sample I posted above was not strictly a commercial unit. There are others but I need to find the link I stored.
One thing about 1080, I probably wouldn't be buying any 1080i monitor right now since the 1080p will be available this year. My friend who went to CES saw the new offerings. The new gen plasma sets have solved a lot of the power problems and so heat issues are down.