I've got a Sony Bravia 28" on my desk at work (hard life ain't it!) and the picture quality is good. I'm just not convinced that they're worth the extra money. The one I've got does have PC connectivity on it though (along with the usual component, Scarts and HDMI leads).
The most important thing i'm going to look for in a new TV is how it looks with regular 480i TV being displayed. Be wary of just looking at one in the shops and thinking the picture looks great - I'll guarantee if it does look great that it's a High-Definition picture. What most LCD/Plasma TV's fail to do very well is display the regular TV resolution (which I think is the 480i). I'd insist seeing the lower resolution picture on the screen I'm about to part with cash for. The more expensive TV's tend to stretch the picture onto their screen's better (through image processing chips). The cheaper TV's tend to do it really badly, with obvious image degradation.
A friend of mine bought a Samsung, and it looks great with the Hi-Def picture, but really poor with a normal TV signal (maybe it's his setup - not bashing Samsung's - they're usually pretty decent). I know there's supposed to be a big switch towards HD, but how long will that be? And will the TV actually last that long, or will I be replacing it before most channels are broadcast in HD anyway? If it's the latter, then I wouldn't be bothered about LCD TV's 'just' yet.
The other thing to watch for on PC connectivity (and in general) is that the smaller TV's (to my knowledge) don't natively support 1080 - the really hi-definition pictures which will perhaps be supported by gaming consoles. Very little I know actually outputs at this resolution yet anyway. PC's tend to look crap on the TV. I can't stand it.
Then there's the whole Blu-Ray / HD-DVD setup...

God help us when it comes to getting that right!
I'll be interested in what you eventually go for though! I know someone in exactly the same position (well - looking to change to LCD, no catastrophic loss of TV for Crimbo).
Best of luck in the choice of screen!
