I don't want to sound like I'm giving a scare/sob story, but credit is something to be VERY, VERY careful with. When I was in school I did a similar thing--got an Apple Loan to buy a computer, used a credit card to get some computer recording equipment. You never know what life will throw your way...a few years later I was delivering pizza, and my car started breaking down literally every few weeks...having no choice but to repair the car (or have no income at all) I was spending money I didn't have; the bills started getting out of hand, pretty soon the balance of my loans/card was over the credit limit..and life became, honestly, a financial nightmare. At that point I realized I'd never really needed the things I bought on credit, and passionately wished I'd never ventured into it.
Basically, credit cards or nonessential loans are trouble waiting to happen. I've known several people, including myself, who were otherwise very responsible people who got hit with severe unexpected expenses and ended up in a very bad situation w/ credit.
Just my perspective on it. It's not a bad idea to have one credit card, for insurance against smaller, necessary, unforseen expenses--light car trouble, speeding tickets or whatever. But I agree with earlier posts--don't use credit for anything non-essential that you can't unquestionably pay off in a month or two.