I recently received a PM asking me how this turned out for me, so I thought it might be of value to someone else.
I brought two Sony LCDs (a 40" and a 52") from the US and the PS3 as well.
First, the power voltage. Both Sony LCDs operate on 220V without an issue. I knew in advance that they would because the labelling on both said 110-240V input. The PS3 is 110V only, so I am using that with a 110V converter which you can find at most electronics stores here.
Second, neither TV will directly decode the PAL signal here. I'm using nowTV which actually comes in over the DSL line as data before being decoded by the set top box. I bought an Atlona PAL to NTSC converter to solve that issue. However, the video quality is definitely less than stellar and I suspect that it is, in part, due to high compression by the nowTV people. But it works. It is primarily used by my kids to watch Disney Channel and Boomerang.
High Def content I'm not sure about. I've learned that there is an HDMI 50Hz and an HDMI 60Hz. I bought an Atlona 50 to 60Hz converter as well before I left the US, but since the available High Def content is so limited, I did not spring for the extra monthly fees here. There is High Def being broadcasted Over-The-Air as well, but the signal is completely blocked by the mountain behind where I live. So I can't really tell if HK High Def content would work directly or not.
Personally I am more of a movie buff. I generally watch content from the AppleTV or streamed from my NAS HDD to the PS3. I've learned over the past few weeks that the PS3 is a spectacular media server, with plenty of horsepower even when streaming HD 1080P movies that are stored on the NAS.
Region 1 DVDs and Blu-Ray discs are widely available here, so bring your US DVD player if you want. My local movie rental place only rents Region 1 stuff from what I can see.
I hope this helps somebody.