Offer your insights or judgment on the input financial query or topic using your financial expertise. Reply as normal question answering

Optimal number of credit cards for a given length of credit history
I have found that between the Discover card and a Visa/Master Card a person has everything covered. In my case the Discover card had the best deal (cash back) and the Visa/Master Card took care of those times a vendor didn't take Discover. One big Box store (Costco) did trip us up, so we did end up getting an American Express card. But Costco is dropping that requirement in 2016. One advantage of only having a few cards is that the increase in your total credit line will be split among fewer cards. In your question the highest  max limit on one card is $2500, what will you do if you have to take a flight at the last minute and the Airline ticket is more than that? If you need a higher limit, ask for one of your existing cards to raise it; don't go out and get another card. If you see that one of the companies that you already have a card with has a better card, you can ask them to convert your account to that better card.  Yes higher total limit does help your utilization ratio portion of the score. But there is some opinion that they also look at the utilization ratio per card. So hitting one card to nearly the max can hurt your score. Three caveats about the number of cards: