You can get a lot of information and misinformation on the newsgroup alt.tv.tech.hdtv. It's a Usenet group, so there are the usual idiots, nutcases, and loonies. But there are also a lot of contribs who know their stuff.
My own personal preference on RP sets is Mitsubishi, which provides a user-available 64-point convergence interface, which allows you to precisely align the red, blue, and green images for a crisp clean video output. The Mitsu also allows you to select 6500K as your color temp, which is what you want, not that screaming 10,000K temp you see on sets in the showroom (overwhelming blue cast).
Convergence is not an issue on fixed-pixel displays, like plasma and LCD. By definition, convergence on a fixed-pixel display will always be perfect. And you won't have any geometry or pincushion-distortion issues, either. The plasma is an active display - the pixels generate the light. The LCD is passive - there's a lamp behind the screen pixels and the pixels modulate what light passes thru. LCD and plasma sets have the rap of not being able to reproduce a full truly-black black. But they're improving a lot of late.
Have a look and see what you like. But note that in the showroom, all the sets will have the brightness, contrast, and color cranked up to make them stand out. That's not the way you want them to look at home. We've got our Mitsu running at 38% brightness, 40% contrast, and 38% color. Looks absolutely natural. And the tubes will last twice as long this way. Of course, ours is a standard-def set, we haven't moved to HDTV yet. When we do, it will probably be a plasma, since I'm such a convergence perfectionist. Coupla years, I'll let you know.
Michael