I used to be a big proponent of DLP. It was a great technology. However, over the past two years, LCD has come down in price quite a bit, so much so, now, that I'd recommend LCD over DLP, for anything under 50". Over 50" DLP is still a great option, if you have the space for it.
And I wouldn't write plasma off, just yet. It did look like it was on its way out, but it is enjoying a much slower departure from the marketplace than original expected, and for good reason. It's still the best for certain applications, i.e., a room subject to lots of light infiltration, at times.
Do yourself a favor, though: Buy either Samsung or Sony. They're, far and away, the highest quality and most reliable brands, today, by a wide margin, according to practically all independent testing.