SXRD vs. Plasma vs. LCD, which is best? DEPENDS.
LCD
From my viewing, LCD looks more digital than the rest. I won't comment much on LCD but that would be on the bottom of my list specifically for inadequate black levels. If you watch primarily in the day and have a lot of light in your room you may prefer LCD for its very vivid colors and I'd have to guess it would show off the best in bright settings.
SXRD
I'll give you my honest opinion. As one that has been upgrading their TV every year I never "protect" my purchase by claiming it's better than something else as I will upgrade the following year (so long as finances allow). I'm not one who's been scared off by the "green blob" as I've never seen one on my set nor my friends or even in local stores. I do however have slight greenish and blueish tints in the corner (the average viewer would likely not notice it).
So far I still like the SXRD best of all the microdisplays. It doesn't exhibit as much noise as the other DLPs or the JVC. With good HD content and can look quite well. My Xbox 360 games and HD Trailers on it look great. However I find the picture a little soft still. Compared to some DLPs and especially plasma the SXRD can look soft.
PLASMA
I have to say that when it comes to plasma, for me it's pretty much Panasonic or nothing specifically because none of the plasma competitors touch Panasonic when it comes to black levels. If you want to compare the Panny plasma to the SXRD you must turn the contrast down from the vivid setting from +31 to at least +20 and turn the sharpness down to at least -4. Otherwise it will look oversaturated and just poor.
One thing you have to realize when comparing the two is that you're impression of the plasma will be different in home than in store. I know this by personal experience and by comparing the Panny plasma side by side in my house on via different sources in both bright and in darkened settings. In store, you'll find the SXRDs to likely be brighter and have better black levels, UNLESS, you view both in a lower light setting. The SXRD will outdo the Panny in brighter light settings because the screen back in a blackish color while the Panny is grayish (why Panny does this i don't know

). However, in lower light settings the Panny plasmas are a notch or two darker than the SXRD (even with the SXRD set for maximum black levels). The Panny is also very noticably sharper and a much more 3Dish look to it. This years Panasonic is even more detailed in darker areas than the SXRD (Last years Panny was several steps behind the SXRD).
However, with plasmas they say it's about as hard to get burn in as a CRT Tv (don't know if I believe that or not), BUT image retention is very real. How much do you have to worry about that? I can't answer that one.
I think the biggest problem with opinions on this board is that sometimes people don't take into consideration that your viewing environment affects your opinion. If your main viewing during the day with bright lighting you may like LCD best. If you have a lot of room glare, you may oppose plasmas for their glass screen. I oppose LCDs for inadequate black levels. Some may hate the SXRD for SSE. The list goes on and on. The fact is, ALL of these displays are far from perfect and you have to make the best choice for what fits your needs. Retailers sure don't help out much either as their feeds are typically poor and you can't view these televisions in enviroments that will reflect more like what you can at home. I wish I could see what types of black levels new TVs are capable of in darkened rooms but in my area that's IMPOSSIBLE:MAD:!!!