Pioneer Kuro is the top of the line for Plasmas.
Panasonic would be my next choice for plasma.
For LCDs, Sony or Samsung, can't go wrong with either.
I would not get a RPTV, those are on their way out as most manufacturers have ceased production.
(Sharp has excellent customer support but they suffer from backlight bleeding and banding too much)
If you want even more opinions check out AVS Forums, it's like E90Post for Displays:
http://www.avsforum.com/avs-vb/forumdisplay.php?f=9