I have a 50" Pioneer Kuro plasma, PDP-5020FD, that I bought 3 years ago that I wouldn't trade for anything currently on the market. The darkest blacks that you'll find anywhere and the picture is absolutely amazing. There are still a few out there if you look hard enough.
If I had to buy another TV, I'd definitely go with a plasma and would recommend a Panasonic if you can't find a Pioneer Kuro.