My personal valuation, with united at 100
United 100
American 70
Delta 85
Alaska 85
US Airways 95
Aeroplan 80
British Airways 50-55
ANA 85-90
Qantas 40-45
Chase UR 110
Amex MR 90 (assuming no xfer bonuses)
SPG 190-220
IMO American and BA miles are way overvalued by most.