Also consider projectors. I have a Toshiba 40H80 16x9 TV but now that I am working on a basement HT room where I have less walk-through traffic and a little more light control, I am definitely going the projector route. There are some very good FPs in your price range.
Of course, I also have the advantage of having the 40H80 to leave upstairs for the wife to watch her damn Trading Spaces on

and I can run HDTV through that as well.
I have no comment on Mitsus. I assume you have visited your local Big Screen TV Store or whatever it is called. Last I checked, they only sell Mitsus. If you do go the RPTV route, check out the prices at Belmont TV. There is one in Wheaton and they sell Sony, Toshiba and at least one other brand. The prices are quite good and the service is above average.
www.belmonttv.com if memory serves.
I have Paradigm speakers and love them.
Hsu research makes great subs at very good prices, shipped to your door. The VTF-2 is a lot of sub for a very good price.
I own a Marantz SR-7200 receiver than I am also very fond of.
Mixture of Monster and Tributaries cables.
As for DVD players, I am on my third one since my Toshiba 9200 was stolen some time ago and they had already stopped making it. I have a Denon now and still don't like it half as much as my older Toshiba.
Best of luck.