You need to look at your overall credit scenario. Are you carrying balances on your credit cards? If so you'll want to not go over 50% of your total credit line available under all cards, so it behooves you to have some credit headroom with the other cards. What about annual fees? I've gone to MyFico before to see how my FICO score will change based on my closing accounts, it may cost a couple of bucks but probably would be worth the investment.