1st)
well if you are going to get a projection tv, it makes think that since you are going to need to control the ambient light in the area at least a little bit... why not go all the way & get a front projection system? perhaps the Sony VPL-HS51 with a nice nine foot screen (combined would cost less than that TV).
2nd)
you will probably want your dvd player to at least be a progressive scan, but since that TV (& the projector I mentioned) has a digital input, perhaps look into a dvd player that has a digital output & can upsample to the various HD formats. One I know of off the top of my head is the samsung DVD-HD841.