steve, i'll just repeat what i said in another thread:
i bought the margi dvd-to-go card on impulse. you'll need to get an external dvd drive. one solution is get an external 5.25" ide/pcmcia enclosure for about $89 to mount a dvd/cd-rom drive. so, that could cost about $150. and, you won't like the picture quality on the DSTN screen. DSTN doesn't have high refresh rate (to turn pixels on and off?) so you'll see ghosting effect.
so if you really want to play dvd on the 1200, look to spend about $150 for an external dvd player w/ enclosure. you can hook the dvd card to an external monitor via RCA jack, since DSTN isn't good for dvd playback. and about $75 for a margi dongle that has optical out if you want to hook up a DD 5.1 receiver.
i will put together the external dvd player and test it out. i'm sure the performance should be ok. i'll let y'all know how the movie turns out on the DSTN screen.