Listen to what these people are telling you. When I was 20 years old I had accumulated $18,000 of credit card debt spread over 5 different credit cards before I knew it. I had to learn the hard way to wait to buy things. I'm 26 now, and thank god, I paid off all my debt, bought a house last year, and have the ability to save 30% of my take home pay.
Do yourself a favor,
no more debt! If you have the ability to pay off your debts now then do it. Applying for more credit only hurts when you have other cards that are above 75%(could be 80%, can't remember) of their limit. If you don't know your credit score, find out. If its below 700 kiss that apple goodbye until you can bring that score up or pay cash.
Pay off your credit cards then call each of them and demand the best fixed rate possible. Keep the card with the best rate and cancel the rest. Don't be afraid of these people either. Tell them what you plan on doing.
Just playing around with the calculator: $2500 mbp @ 19.99% paying the minimum payment each month will eventually cost you $2500(cost of mbp) + $2862.43(interest charges) = $5362.43. Not to mention over 16 years to pay. Think about what kind of mac pro you could have next year for that kind of money. Even if you paid double the minimum payment and only half the interest it would still be close to $4000 for a stinking laptop. Nothing against the mbp, of course
Enough of my rambling, sorry