Another vote for the Capital One Spark card. We are getting $500/mo + back via the 2% cash back, which has been a much better value for us than the miles we were getting previously with an Citi AAdvantage American Airlines card.

I have a reminder setup to request a statement credit at the end of each month and it hits our P&L as income.

Something else to be aware of is that some business cards will hit your personal credit score. The Capital One Spark card I have does, but the Citi AAdvantage card I had previously doesn't.

I pay in full every month so it actually improved my credit score a few points as it added $30K in available credit with 0% utilization, but if you are going to carry a balance you could take a hit on your personal credit score - especially if your available credit utilization is high.