I have a sony w series that I like an aweful lot. It had the perfect mix of vividness with real life colors that put it over the top of all the other brands including Samsung in the price range. I will say that Samsung and Sony are very close in features and specs, with the Samy's usually coming out a little cheaper. One major plus for me with Sony tv's is that the cross communication between Vaio computers, the playstation and the tv etc. allows one to stream content between the devices very easily.
Especially in your price range, stick to 1080p LCD rather than plasma. Some of the new technologies have finally started to filter down to affordable models, like 120+ hz, LED backlights, etc. The 120 hertz really cuts down on the motion blur that was one of the biggest complaints about LCD's for years. What I like most about my tv is that not only does the 120 hertz eliminate almost all the motion blur, but the processor is very good and doesn't goof up the picture to make it look like a pan and scan image. And by the way, it's not even worth considering 720p anymore; that ship has sailed.
Really the only complaint I have about my tv is that it's an 8 bit panel so I get a little bit of that paint by numbers effect when a picture comes on that is supposed to have very smooth gradations, for example when you see an image of the beach in full sun with dark blue sky above. Unfortunately, the only way to move up to 10 bit panels is to spend another maybe 800 dollars.
For me, buying the tv I did was a decision to get me through the interim. I know that while tv technology is constantly changing, and there will probably never be a stop to newer and better, in two or three years I will be able to get a very nice 60 inch LED backlit 240 +hz with 24p option playback and at least a 10 bit panel for maybe 2-3k. Depending on how the economy goes, I might even be able to get that tv in an OLED in my time frame. So I figured I did not need to buy more tv than I did for about $1200. In time I will put my current sony in my bedroom or office, and the future monster will become my main tv. With the specs I just mentioned, 1080p HD will for all intents and purposes be tapped out for quality and unless and until somebody figures out a good way to distribute 4k or greater signals, I will be golden.
I got my Sony at Costco, and if you pay with a Costco Amex you get a three year warranty and 90 days to decide if you really like the thing. If you go to Costco, don't scrimp and get the Vizio, it is not the same as the Sony (also in durability), I speak from experience. On the other hand if you're not that picky or maybe have slightly impaired eyesight, and no interest in plugging the tv into anything but a cable box and a dvd/blu-ray player, save your money and get the Vizio.