Spark Cash Business Credit Card
is the first one that comes to mind. It's a 2% across-the-board card, no caps, $59/year.
Technically, the Spark Miles Business Credit Card
would be similar, earning 2 miles per dollar spent across the board, no caps, $59/year, but I don't know how favorably Capital One's miles rewards compare to the points you earn through your Business Gold Amex, so the cashback option might be preferable to another points-based system.