If it wasn't for the fact that I am planning a very specific home media set-up that requires a very particular LCD for technical reasons, I would definitely choose a plasma. Modern plasma screens don't suffer from screen burn in the same way as the earlier models did; nor do they put out as much heat or suck up as much energy.
Of course, the limitations of older model LCD screens are also disappearing on newer models, too. Better blacks, wider viewing angles. But LCDs will still cost you more for what you get.
When OLED screens finally start getting mass-produced in sizes around the 50" mark, achieve significantly longer life-spans and miraculously plummet in price, then I may look at getting one of those.