I like Sydney too. I would live there if I had a billion dollars, maybe, only because I'd want to live someplace with one of those amazing postcard views of the harbour.
Tokyo is alright but it's endless square miles of people and has no depth, at times. The safety and cleanliness are nice, there are a bunch of women who are 5-7's and then some knockout 9.5-10's here and there, people are reasonably polite and not out to ruin your day, and if you can buy it with money (legal or not) you can probably get it in Tokyo. The cost of living is pretty outrageous sometimes though. I can't imagine trying to live in Japan on a low income, it doesn't really seem possible to enjoy much here if so. In light of recent exchange rates, you really need a good (for) NYC type salary or better to live.
Seoul is depressingly ugly, dirty, insanely expensive if you want to live a civilized existence (really, most just do not) and doesn't offer much at all in the way of dining or anything world-class, and the people are generally very weird - but you can go out on the streets every night and people are out having fun, they're positive, it's pretty safe (almost like Japan, except people are a bit more hot-headed) and there's a ton of fuckable talent out there. Hardly ever see true 10's, because they have a weird standard for beauty in Korea, but there's a lot of 8-9's wandering around, with pretty low standards. It's pretty easy to have fun out there. I've thought about moving back in order to save a little on rent and things like car ownership, and I get along better with my own people out there - but the thought of the food and drink in Korea bothers me still. Also, I decided that if I do Seoul again, I'd have to buy a bunch of shit in the US and put it into a container and ship it to myself in Seoul if I ever wanted to have nice examples of things like furniture and housewares, and I'd regularly come back to Japan, like once a month at least. Sometimes to just buy things like groceries and liquor. It's pretty bleak.
Those are about the only places where I can live for extended periods, I think.