1st - Oslo, Norway
2nd - Tokyo, Japan
3rd - Reykjavik, Iceland
= 4th - Osaka, Japan
= 4th Paris, France
6th - Copenhagen, Denmark
7th - London, UK
8th - Zurich, Switzerland
9th - Geneva, Switzerland
10th - Helsinki, Finland
Full Article here
Note the absence of any U.S cities.
BTW Dayv, I will be living in L.A, and I'm aware that it is more expensive than most places (and also apparently more dangerous, but I'm a born and bred Londoner and I'm pretty sure I can handle it). My wife is from North Dakota and the cost of living there is very low. Somebody from London could sell their home, take the money and move to North Dakota and live like a king.