Like we've mentioned before and is repeated here, MAKE SURE that the TV has a good picture at ANY viewing angle at various distances. This alone will eliminate almost every brand of RPTV except a VERY few. I will say that there is a reason why Mitsubishi has the highest amount of sales and repeat customers when it comes to big screens. I will also say that the Pioneer Elite's are EXCELLENT but pricey. Check them out for yourself and see what YOU like.
To repeat what was already said (again), having ANY TV properly aligned ( convergence, contrast, brightness, color, etc...) CORRECTLY via calibration standards and NOT by eye makes a WORLD of difference. Most EVERY tv comes set WRONG from the factory and the "amateur tune up" doesn't do much to help. Keep in mind that RPTV's work best with a small amount of difuse light coming from behind the TV.
I would also like to add that if a GOOD quality RPTV is PROPERLY set up, you will not have a problem viewing it up close OR at quite an angle. I can view my 55" at a 90* angle from a 20' distance without ANY problems whatsoever. Our normal viewing distance is also only about 10' from the screen. Those that can't enjoy their big screen like that REALLY need to check their settings and probably invest in some rudimentary ( and quite easy ) calibration discs like Video Essentials or Avia. Both are WELL worth the money, even for a "normal" sized TV's.
One more suggestion is to look for a TV with PLENTY of inputs. Component video is most desired with S video being second and composite video being bottom of the barrel. Hope this helps. Sean
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PS... don't forget to include a "screen guard" when shopping.