Consider that it varies a lot between *A Members:

ANA Mileage Club - 220,000 (Business) or 340,000 (First) for up 39k miles
Asiana Club - 270,000 (Business) or 360,000 (First) for up to 40k miles
Lufthansa Miles & More - 280,000 (Business) or 400,000 (First)
United Mileage Plus or US Airways - 300,000 (Business) or 400,000 (First)
BMI - 300,000 (Business) or 400,000 (First) - alternatively, can redeem for a lot of oneway awards, or use cash & miles

Shame that there isn't a single chart like the Star Silver and Star Gold charts that covers all the RTW awards on Star and/or Oneworld.