I have a 61" Samsung DLP and love it. It uses LED lights instead of a bulb. The bulbs for regular DLP's are pricey ($200 to $400). The price of my LED over the same model using a standard DLP bulb was only a couple hundred dollars different about a year ago. If you are putting a DLP in a room that has some light sources that are bright, like a single lamp in the back of the room, it will reflect out of the back of the screen. Usually, you can solve this by moving the lamp, or turning it off.
I also have a Samsung 46" LCD that is really nice. Two years ago, and maybe even a year ago, if you were looking for a flat screen over 40" you should have narrowed down to DLP or plasma and plasma usually had the better picture. LCD in the over 40" TV's today, can give any of them a run for the money. If you have to have thin, I believe LCD is the best buy. If you just want size, DLP is the way to go for value. Plasma has a great picture, but the price, in my opinion, kills the deal.