I suggest you consider the Chase Ink Bold with Ultimate Rewards
25,000 bonus points after your first purchase combinable with your Sapphire points. First year free. Since it is a business card, Chase may give it to you, even though you have several personal cards. If they first refuse, call the reconsideration line (try 888-245-0625, 888-270-2127, and/or 888-245-0625) to tell them that you want a business card to keep your expenses separate.
You may read about the card on my website below on the Credit Cards > Bank and Other Travel Cards page.