The Panasonic TH-PZ700 and TH-PZ750 series, as excellent of televisions as they are, are nowhere near the depth in blackness of the KUROs. This is not to say I wouldn't recommend a Panasonic plasma (because I would), but it is to say that I would recommend a Pioneer plasma over Panasonic for reasons of performance.
I would not recommend the Samsung FPT84 series, as they are inferior to the Panasonic when it comes to color accuracy, black level depth, and noise removal abilities.
Large Sharp AQUOS 1080p LCD sets have dissappointed me (32" and under are fantastic, but there is much to be desired in their larger sets.).
If one had to go with Panasonic, I would recommend going with the TH-50PZ700U, not the 750-series. The 750-series has what Panasonic calls an "anti-reflective" chemical coating on the screen. I disagree. Not only can I see just as many reflections in the 750-series as the 700 series, but contrast is significantly lowered in the 750, especially in highly-lit environments! Furthermore, the 750-series seem to give off a silkscreen effect (glittery screen), which is a large distortion of the image. The 700-series will not dissappoint.
I will say this time and again, the 1080p thing is not a huge thing (certainly not a deal-breaker) for most applications of large-screen televisions. So long as a television can ACCEPT a 1080p/24/30/60 signal, then it is golden. I would recommend concentrating on more important things (like contrast, black level depth, color accuracy, SD performance...).
The Pioneer KURO televisions outeperform the Panasonic TH-PZ700/750-series televisions in many key areas. The most significant factor is SD performance, as SD broadcasts are going nowhere fast (and DVD's are SD as well). The Pioneer makes SD look like HD when sitting next to a Panasonic displaying SD. The ASIC video processor is rather good at performing basic functions to make the picture look more acceptable (nowhere near perfect, but what television is?).
ANY flat panel display will be less reflective than a CRT. All of the major name-branded flat panel displays have some measure of protection against glare. This being said, not all flat panels are created equal. I have mentioned above about the Panasonic technologies, lets go over the Pioneer's. The KURO Pioneers utilize a screen filtration technology. This is a non-chemical method designed to filter out reflective glare, and is measured as a percentage of the light they filter out. For example, Pioneer KURO displays are capable of filtering 80% reflective glare off the screen. Pioneer combined the screen fltering technology with a chemical coating on the screen, which apparently filters more reflective glare away from the screen. The nice thing about the chemical coating on the Pioneer displays is that there is no silkscreen effect that plagues the Panasonic 750-series.
At 50", 5.5ft is the resoltuion threshold for 1080p. So, if one is sitting 6-8ft away from their 50" screen, they will not be able to discern 1080p from 720p. This, of course, would only be magnified at a greater distance. Closer than 6ft makes for an uncomfertable viewing experience.
The life expectancy on a new Panasonic or Pioneer television is 100,000 hrs. If you view your set 7hrs a day, 365/6 days a year, then your set will last 39.54 years. Of course there are measures that need be taken to assure these results, but it would be the same for any other flat panel set (power conditioner, UPS, groundloop isolation circuit, 500hr break-in and ISFccc color calibration after 500hr break-in).
The ELITE 1150HD is an excellent choice for all of the above. You would be getting one of the best performances money can currently buy. This being said, the Generation9 Pioneer plasmas do arrive this summer, with an 80% increase in contrast (80% deeper blacks). They will be exclusive 1080p as well. Of course, this will mean higher pricing, but who knows? I will in May. I can understand if you can't wait that long, which is why I encourage that you get the 1150HD, but it's up to you. Good luck.
-N.