From an owner of 2 wallmounted Panasonic plasmas (one 42” and one 50”), I second everything said by TrueKnightGalahad and savedbygrace.
I have also purchased from Visual Apex and Monoprice.com. Both are quality dealers that were very upfront with me.
After you buy your TV, come back for advice on 5.1 surround sound, LFE subwoofers, DVRs, antennas for over the air signals, and best cable or sattelite boxes. Hope you have some money left over, the TV is just the beginning.
I forgot high-def video game systems and HD-DVD or Blu-Ray.