The Capital One Spark Cash Card is for a limited time, offering UP TO $2,000 CASH BACK (previously $500). Yes, you read that right, but the spend requirement is pretty steep. You can earn a bonus of $500 when you spend $5,000 in the first 3 months and $1,500 when you spend $50,000 in the first 6 months of opening your account.
Recall, with the card there is $0 Introductory Annual Fee the first year, then $95. You earn unlimited 2X CASH BACK on every purchase. You pay no foreign transaction fees when you use your card on purchases made outside the United States. You can redeem your miles for cash back.
If you can swing it, this $2,000 is the highest I have ever seen. However, you need excellent credit to be approved. Good luck if you go for it!