I redeemed this route last summer in Business (80,000 Asia miles). At the time, they didn't confirm the exact price for the surcharges and taxes but they the amount they mentioned as the approximate amount was much higher than by doing a dummy booking. In reality, when they charged my card, it was the amount it was supposed to be. So as with the advice above, book the ticket and see what happens. I'm sure the amount will be correct.