Well i currently own a 46" Toshiba DLP and while i LOVE it, in hindsight i would have picked up a Plasma... Granted i got an amazing deal, so im happy 🙂
My complaints? Black's look grey if the room has any trace of light in it, you can hear the colorwheel/fan from a few feet away, and my first lamp blew after only 400 hours... The picture is phenominal, but if i were to do it again, i would go plasma.
Also, as for 1080p, maybe its just me, but ive seen it in person and didnt see a HUGE difference from 720p/1080i. Not enough to make me regret my purchase.