I've had the JVC AV-30W585 for almost two years. I paid $750. for it at a retailer that typically charges 10% below MSRP. The Walmart price for the #777 seems too low, but a large-purchase deal might make it possible. According to the specs, my model is 2.8 lbs. heavier than the #777 and it doesn't have a digital tuner. I chose it because it gave the best picture of any HD set I saw and also did very well with SD programs. Its picture is sharp and has excellent colors, but it has a gentle, eye-friendly picture. It doesn't have a brilliant screen that overpowers your senses, but it's one you can watch for hours without fatigue.
The exact number of scanning lines in its display is still a mystery to me. It is advertized as having a 1080i scan and the manual confirms this. Its description indicates that all inputs are scaled up to 1080i. However, when I contacted JVC's technical dept. and asked for some complete specs about its screen, they replied that I was mistaken about the 1080i scan and said that it actually uses a 720p display. What do you make of that? Looking at the wonderful image it gives, especially on fast-moving sports and flying birds, I wouldn't be surprised if it really does use 720p. All these companies are very secretive and often ambiguous about such details and this seems to be an example of that.