When I had this problem, I chose plasma.
Pros are better viewing angle, better blacks, bright picture viewable in a bright daylight room, thinner profile, and longer screen life. Cons are possibility of burn in (I have had no problem}, some picture sticking when you go from a menu or static image to a dark or black screen, but it fades very shortly, and initial expense is high.
The big downside for LCD and DLP for me was bulb replacement every 4-8000 hours depending on who you talk to. That could be a 300 dollar expense every year or two depending on how much viewing you do a day. My plasma screen is rated at 60,000 hours to half brightness. Just the savings on bulbs could pay for my plasma over the years and certainly make up the difference in a few years.
Before you buy, view a plasma and an LCD side by side in a bright area. Usually the dealers put the RP TVs in a darker area than the plasmas so you can not compare under the same conditions. Both can be equally sharp, but I believe the plasma is brighter.
Consider your viewing area and the long term costs before buying either.
The tv market has changed so much and we are looking for a new tv, what a choice there is. Seems like lcd rear projection is the clearest and budget minded but plasma is dropping. Anyone out there who has done the homework and research, this is daunting.