As stated above, AMEX is going to be your best option if your suppliers accept it.
The Amex Velocity Platinum card earns a flat 1.5pts per dollar spent and is uncapped. It currently has 100k point signon bonus which is handy - you can grab a referral link for the card from fellow AFF members in the Referrals sub-forum.
On the MC / VISA front things aren't as simple. There are a few cards that offer 1:1 earn rates, but they are all capped (that I know of). The ANZ rewards black has an effective Velocity earn rate of 1:1, but is capped at $5000k a month. The Coles rewards MC earns 2 flybuys pts / $ which is the equivalent of 0.87:1 Velocity points / $. If you combine that with the regular 15% transfer bonuses between flybuys and Velocity you can make it 1.0005:1. Again you'd need to be aware of the annual maximum transfer limit of 138,000 flybuys points, equivalent to 60,030 Velocity pts.
If you're not already doing so - under the new world order - it makes a lot of sense to switch as much of your spend across to AMEX as you can!!
Good luck!