I posted some of my HDTV findings in another thread:
http://www.geoexpat.com/forum/hdtv-c...424#post152424
To touch on some of the other questions...
HDTV
The two major franchise electronic stores in HK are Fortress and Broadway. It felt like nearly every district in Hong Kong had one or both of these shops. You'll find most of the brands you're familiar with.
When it comes to direct-view flatpanel HDTVs, bear in mind that Sony & Samsung share a joint factory manufacturing LCD HDTV panels. Both are highly regarded. If you chose to use your set for gaming, I'd recommend LCD over Plasma. Majority of plasma sets are only 720p and the glossy glass panel will cause significant reflections in a bright windowed room.
XBox
If your move is more permanent than temporary, I think it'd make more sense to purchase an XBox in HK. Most electronics purchased in HK through legit vendors carry an "international" warranty. US-bought goods only carry a "US warranty" which might be rendered useless in HK. Accessories and features also might be localized. A HK XBox is likely to come with a power supply for HK outlet plugs.
While the US uses NTSC for it's video signal, HK uses PAL like parts of Europe. You'll need to research whether an XBox 360 has a video-out that can switch between the two. Golden Computer Centre in Sham Sui Po district is packed with gaming vendors.
TV Programming
In the years I've made repeated trips to HK, their English Channel's prime-time broadcast consisted of Alias and "24" but 2-3 seasons behind. I haven't watched any cable there, but a service like iCable offers television and broadband for around $150hk. If I had to stay in HK long-term, I'd rather wait for the DVD collection after the show's season or setup a SlingBox stateside to stream video via broadband.
CTG