It's best to have one card with a higher limit, rather than several cards with lower limits. Keep your balance low or, better yet, pay it in full each month. The high limit-low balance will raise your credit score due to the ratio. Paying in full each month will likely cause the credit card company to raise your limit about every 6 months, which will also help your ratio. Having a lot of store cards will lower your score, so always use a premium card (Visa, Mastercard, Amex), and preferably one that offers a rewards program.