I had a 5020 at the start of all my HDTV troubles, aside from the awesome blacks, it isn't that impressive. (loud buzz, dim whites, smudges all over the screen)
I am very interested in where vizio is going with their sets, I had a 2008 32inch in my house for a week a while back and I was very impressed with it and how it stacked up to my Panasonic. The Vizio was a gift for my little bro but it did leave an impression on me.
(I've also had several Samsung LCDs and they were nice, but man the lag killed them.)