American Express Essential Credit Card You get $50 ($75 with referral) if you apply online and spend $500 in the first 2 months.
American Express Qantas Discovery Card You get up to 7,500 QFF points when you spend $300 on purchases with your Card within the first three months of Card membership* (OR Earn up to 15,000 extra QFF points when you apply by 31 May 2016 by using the referrals)
American Express Velocity Escape Card You get up to 15,000 Velocity points after $300 spend (within 3 months)
These 3 cards are all $0 annual fee cards. If I only want to apply for one, which one should I apply?
I'd recommend https://www.ozbargain.com.au/node/236581
It is a dual card arrangement from ANZ. First year free. Lots of benefits. Give it a look.