It isn't a universal truth that DVI/HDMI is the best connection for High Def. One factor largely overlooked in discussions of connectivity vs. PQ is that there can be significant differences in the characteristics of the signal paths through the various inputs of a given HD display. I've used only the VGA input to send HD to my Hitachi PDP for a couple of years now, because it yields the best image by far of all the channels into that panel. If you examine the schematic, it doesn't take long to see why - the VGA input passes through less signal processing circuitry than the component or DVI inputs. The result (in the case of the eight bit 42HDT55) is that a high quality source connection to the VGA input delivers the best clarity, with much more detail than the other inputs, and no processing artifacts. A lesser source is, at least, made no worse by digital meddling or a degraded noise floor.
I use a component switch box driving a component/VGA transcoder so that I can utilize the best input for all my HD sources. I don't mind at all that, other than black level, white level, and color temp, there are no picture adjustment controls available. The only thing I need to adjust for differences in source material is black level.
It is likely that one type of input will be better than the others for connecting your display - but you can't just asssume which one it will be. It's worth discussing this issue with the ISF tech when you have your display calibrated.
regards, billb....