Limited-time bonus points on some cards. E.g. American Express Explorer® Credit Card, 85k points.
Platinum Edge is pretty good for every day as it has 3 points/$ for supermarkets and petrol stations + the first year is free and a travel $200 voucher every year.
P.S. First deal post, please be gentle. :)
Just a heads up, Amex credit has changed how it works.
I believe you are charged the first 200 (or more) and you'll be reimbursed the 200.
This means you can't pay <200 as it won't trigger the reimbursement. Forces you to pay more essentially.