I'm looking to use asiamiles to upgrade an economy ticket to business but although there is redemption availability, I can't find an appropriate economy fare. The CX website only gives prices for restricted fares so I guess it may mean calling them up to book it. However does anyone have an approx price for outbound in Feb and return in Apr (flexible on dates)?

Also haven't redeemed on CX before so what would be the additional taxes payable if any? Finally how does that compare to the taxes on a straight economy redemption?

Thanks

PS. What would be the best way of getting a further 5k miles?