I would be careful with buying any HD screens right now.
One needs to be very clear about where the material is going to come from. Currently, Sky TV is the only option. With all other data sources there are compatibility questions.
This is partly because of HD security. Hollywood doesn't want HD data cracked the way that DVD's CSS security was cracked several years ago, by disassembly of a piece of PC-based DVD player software. This time around, there won't be any PC based HD DVD players. The data stream will be encrypted all the way from the source to a decryption chip inside the display device, or a chip on the PC's video card if you want to play a HD DVD in a PC.
There are all sorts of other measures going in, like blacklists of known compromised keys which will be distributed on all HD DVDs as they are pressed, and every HD player (or anything else that decrypts HD data) will have to download this blacklist and update it's internal blacklist.
It's quite a nightmare. I used to work in comms security so know a fair bit about the challenges. They will probably fail too, a few years down the road, but they will cause a lot of users to get screwed with expensive HD gear that is next to useless.
There is a lot at stake for the movie business, because if a true HD version (i.e. 1080 lines) of a famous movie gets compromised, that movie will be done for good. It won't be like cracking a 625 line DVD of the same movie; a cinema will always be better quality.
In a lot of respects, a lot of the HD screens that litter the floor at the High Street outlets are a massive con, because they are good for Sky only, and work natively only for 720 line data.
Most of the HD screens currently out will never be able to play HD DVDs - except via their analog inputs.
Cables are the biggest con going. I used to design power amps, 0.001% THD at 400 watts RMS. That was before the bottom fell out of the hifi market, and to stay in there people started selling gold plated mains plugs, solid silver speaker cables, and phono leads (made in China for £5) for £300. Even Comet etc are playing this ripoff game, selling gold plated SCART cables for £75 (made in China for £1).