FWIW, I bought a Maxent 52" HD plasma last December at a Best Buy. It's a no-name screen that uses Panasonic components.
It's not on constantly, but sees pretty constant use most evenings and I've had no problems. I'm glad I bought a plasma every time I walk past a LCD, DLP, etc in the stores.
Fujitsu Plasmavision P50XTA51UB $550050
63.
1366x7682103154.513.5 LG 50PC1DR $330050
63.
1366x76822034.551.514 Hewlett-Packard HP PL5060N $260050
59.
1366x768 2113361.512.5 Panasonic TH-50PX60U $310050
55.
1366x768 22034.54814.5 Zenith Z50PX2D $250050
55.
1366x768 21032.555.512.5 Samsung HP-S5053 $320050
51.
1366x768 22033.548.513 Dell W5001C $300050
46.
1366x768 220325512