LCDs will be the future flat panel of choice, once they could solve the size and cost issue. which is supposed to happen by 2006 or so. until then, plasma v LCD is up for debate. LCD is suppose to outlast plasma. (but i've never really looked into it, just casual readings, so i'm not sure) but for now, go w/ what you like, and what you can spend. usually LCDs for smaller (upto 40 inches or so) and plasmas for 40+ inches. LCDs are suppose to be smaller and thinner than the plasma counterpart, and once the price comes down, i can't see how plasma tech could compete.
unless you have a dark room, lcd projection, or any projection tv for that matter isn't the most ideal.. for the best picture, even now, direct tube is the best way to go. if you could get over the weight factor..