I have yet to experience a projection system that I've liked outside of an actual movie theater or a dedicated home theater that has been built like a movie theater...too many factors influence the quality of presentation in a home or office. Even when you CAN completely control the light coming into the room, you have to worry about bounce from projected image hitting surrounding walls and reflecting back on to the screen.
For different reasons, I have yet to see a rear-projection set that produces an image comparable to any other display technology.
I still have reservations about plasma...and I can tell you burn-in is still an issue on plasmas. I'm not sure how it happened exactly in our office, but we bought a new plasma early last year (I forget if it was Panasonic or Samsung...we have both in our office) for our conference room. Less than a year after we got it, I started noticing that I could see the Xbox 360's dashboard on it when we're looking at white Explorer windows...and a horizontal reddish-band started appearing not long after. Supposedly my coworkers have been very conscientious about not leaving static images up on the screen, but to have this level of burn-in so soon? This screen has been used more as a computer monitor / gaming display than as a TV, so perhaps its burn-in protection scheme wasn't really designed for such applications?
Plasmas also run hotter and use more power than a comparable sized CFL or LED LCD panel.
I almost bought a Pioneer Kuro...definitely was the best looking picture (and best black levels outside of CRT) at that time. Two things worked against it...the Kuro's picture wouldn't be bright enough for a pleasant viewing experience from my living room during daylight hours and its shiny glass surface would reflect French doors from every viewing direction. I ended up buying a Sony 50" XBR3 LCD TV (the one with the glass frame...which I still think is one of the best styled sets that has ever been made). The set is very watchable even during the peak hours of the day thanks to the set's vibrant CFL back-lighting and matte display surface. This set is now four years old (I bought it refurbished) and I still think it has a great picture, even though newer sets have better blacks (I also own a 40" XBR2 and a 32" XBR6).
If I was in the market, I'd opt for a LED backlit LCD panel. The side-lit ones may be attractively thin, but the back-lit ones look better, especially those that have arrays that can be locally dimmed for truer black levels. Opt for RGB LEDs for a wider color gamut. I'm still looking forward to the day we return to true per-pixel illumination, but these LED LCD panels provide a decent interim solution. Note that LEDs use less power than CFL, run cooler, and should last longer...and should have less impact on the environment when it is time to dispose of the set.
I'd also be tempted to buy a Samsung over a Sony...I find their quality comparable, but the price is much more attractive.
As for "Smart" TVs, if you have a game console like a PS3 or Xbox 360, there's very little reason to get one. The performance of the processors they put into such sets are always inferior.
And I am strongly against using the motion interpolation on the high frame rate sets. It is good to at least get a 120hz set so that you can set it to 24fps mode for watching movies at their native 24fps frame rate...but I find motion interpolation artificial and distracting (at best, it makes movies look like bad TV shows).
I have not been at all tempted to go 3D at home yet. I am especially not a fan of those 3D glasses with active shutters (they are more expensive and tend to make the image duller). I read somewhere that some of the manufactures might put better quality components in their more expensive 3D models, which is truly lame IMHO.