as paxboy said there are a lot of options - you can bet the obvious ones (BA, QANTAS & SIA) will be expensive, Malaysian & Thai are better value normally
A lot of people now use one of the Mid-east airlines
You can get better rates (and lower APD) if you use a Continental starting point normally
The long way round via Japan, HK or Korea is often cheaper but it's a longer trip
Don't use flights via Moscow........