There's a lot of talk on here of going for HD or 1080p, but if you're not feeding it (or plan to feed it) with an HD source from either Freesat HD, SkyHD, Blueray or similar then it's completely pointless.
I've got a Panasonic HD plasma. It is excellent on Sky's HD channels (footie especially), and it does a decent job on regualr DVDs that I feed over component from my XBox, but regular TV and Sky feeds is pretty crappy. It doesn't matter really whether it's LCD or plasma, choose the one with the best picture and motion control and don't worry too much about the technology driving it.
If you're not a Sky subscriber, then I'd definitely be looking at getting one with FreesatHD built in and put a free dish up, otherwise you're paying for capability in the TV that you'll never use.
We stayed in the Lakes last week and the cottage we stayed in had this 20 year old, 24" Sony Trinitron TV/video combo thing in the lounge. We bashed a tape in to watch a movie and it reminded me again how good old TV's and videos were before we were sold this whole LCD/plasma thing…