Need help making TV decision

I'm looking to replace my ancient Proton 27" CRT with something new. I've poked around AVS forum and CNET but still feel confused and underinformed. Would welcome advice here and pointers to other sources of information.

Here's our situation:

-- Can accomodate up to 40"-42" wide display
-- Use Comcast digital cable box through TiVo box as main source; also DVD
-- TV (not DVD) probably 80% of viewing
-- Viewing distance is about 8 feet
-- Can accomodate the depth of a CRT or rear projection, but a flat panel would be just fine (will sit atop 40" AV cart)
-- Don't need built-in audio as I route audio signals through an AV receiver
-- Price not too much of an issue

So....LCD, Plasma, DLP or CRT? HD or ED? One of my main fears is that I will get a set that kills on DVD or HD but leaves me unhappy when I watch an old movie or a Seinfeld rerun or any non-HD TV program. There's also the issue of our addiction to TiVo and the absence of an HD TiVo box for digital cable (as far as I know).

Thanks for any guidance you can provide.