Track down the recruiters here - they shouldn't be too hard to find. Somebody mentioned Robert Walters which is a good start, maybe also Aston Carter and Chandler Macleod. Recruiters seem to find me on LinkedIn pretty regularly but that's probably because I've built up a network of other people in the industry.
Might be tough also as they generally prefer people with industry experience, and there are plenty of them on the market given recent layoffs, so competition will be fierce. Might be better outside of financial services but I kind of doubt it.
For me - I got a job with a consulting company whose client was an investment bank, so got my foot in the door for a job I probably wouldn't normally have been considered for. Once I had the experience (there's a lot to get used to) I switched to working for the client. Probably difficult to emulate but you never know. I initially got offered a job at a blue chip consulting company at a terrible rate, but ended up at an obscure one at a merely not-so-great rate. It eventually improved but you might want to lower your expectations in advance. At least the tax is low (although if you're American I guess you get screwed on paying US tax anyway) although housing is nuts.
Oh, and Hong Kong and mainland China are like two different countries. You can pretty much ignore any advice which relates to the latter. Hong Kong is a very easy place to live in - I love it. People generally struggle more in the mainland. However, if your wife is in Hong Kong you could consider working in Shenzen, over the border, although might be tough to pull off (and the commute to see eachother would be unpleasant).