or are they pretty much the same except with different bells and whistles on them?

In production now, 46″ can be linked to other screens to make an array of 8. One screen will set you back 11500 Euros. Took this video at Mindtrek in Finland in 2009. multitouch.fi

• Pixel Resolution 1920×1080 for display resolutions up to 1080p
• Audio System – 15 Watts per channel to 2 speakers for stereo sound
• Brightness 450 cd/m2
• ATSC QAM NTSC Tuners
• Dynamic Contrast Ratio – 15,000 – 1

Product Description
The AQUOS LC-46D92U LCD Television sets a new standard for large-screen flat panel TVs. With Full HD 1080p resolution, dramatically enhanced black level and an elegant new design, it produces a breathtaking picture quality that is second to none. The LC-46D92U utilizes the next generation of Sharp’s proprietary Advanced Super View/Black TFT Panel with multi-pixel technology, providing 15,000:1 Dynamic Contrast Ratio, 4ms response time and wide viewing angles (176? H… More >>

Sharp Aquos LC46D92U 46″ LCD Flat Panel HDTV