I'm with BMI on *A and its only 80k miles to the US, 100k for UK / Europe. But the class premiums are slightly different. 50% additional premium for Business, 100% for First.
RTW is more expensive at 200k miles, but I think the rules are relatively generous...
1 A round the world trip is defined as one Pacific and one Atlantic crossing.
2 A maximum of 10 sectors are permitted for round the world Awards.
3 A maximum of 6 stopovers are permitted for round the world Awards, which may be within the same zone.
4 Round the world Award flights must commence and be completed within a 12 month period.
The following is a generic award booking rule.....
9 No stop-overs are permitted within Europe. Outside of Europe one stop-over is permitted. A stop-over is a lapse of at least 24 hours between your arrival and departure at any transfer point, i.e. if travelling from London Heathrow to Singapore via Frankfurt, you would not be able to stay in Frankfurt for more than 24 hours
Not as good as ANA, but still valuable IMHO