In general, the best flat panel TVs are still the Panasonic Plasmas. The ST30 or ST50 models are certainly a very good value in terms of price for the size and the picture quality (which is excellent).
However, plasma TVs do not look their best if you have "normal" to bright room lighting or if you have sunlight coming into your room while you are watching. Don't get me wrong, it's not as though Panasonic's plasmas suddenly look "bad" under normal or brighter room lighting. But they only look their BEST under dim or dark conditions. With light in the room - especially bright lighting or sunlight - those lovely, deep blacks turn a bit grey. It gets harder to see shadow detail. And Panny's plasmas still aren't super bright, so they can look a bit dull if the room lighting is bright.
For a bright or sunlit room, I prefer an LCD - but only a specific kind! I only like LCDs that use Full Array LED backlighting. And I only like LCDs that have a matte screen!
The selection of such LCDs is VERY limited. Almost all LCDs these days have very glossy screens. To me, a glossy screen renders any display unwatchable - especially under bright lighting. I HATE seeing reflections in the screen, so I find a glossy screen to be a total deal breaker. Unfortunately, that disqualifies almost all current LCD TVs!
Edge LED lighting is also terrible looking. The backlighting is never even and they look absolutely horrible from any angle other than straight on.
Regular CCFL backlights also suffer from being uneven. I can always spot "clouding" in the backlight or corners that are brighter than the center of the screen.
So only Full Array LED backlighting will do, IMO. Most Full Array LED backlights also have local dimming, which gives super deep black levels, but also adds "blooming", which is a "halo"-type look that shows up around small, bright objects on a dark background (like white text or symbols on a black background, for example. You get a halo of light around the text with local-dimming displays.)
Only a very few Full Array LED backlit TVs do not have local-dimming.
So honestly, the only LCDs that I like right now are Sharp's LC-70LE7xxU series, which is discontinued now and being replaced with models that are WORSE, IMO. Being that they only come in the 70" size and are around $2000 and up depending on the specific model, we're basically back to Panny plasmas as being the only decent choice these days