I really wouldn't recommend getting a new laptop if you don't have the money to actually buy it. Also, if you just WANT the laptop to build up your credit but don't actually NEED it, there are other ways to build up your credit without going $1000+ into the hole right off the bat. Besides, you won't really building up your credit as much as you think if you are $1000+ in the hole and your credit card (CC) has a $1500 limit because your debt-to-credit ratio will be high.
Here's some food for thought:
Let's say a friend of mine and myself decide to get a CC at the same time. They are the exact same card with an APR of 11% and the exact same limit of, let's say, $1500. My friend decides to do what you want to do, buy a laptop, so he goes out and charges $1450 for a new laptop. I, on the other hand, just use the card for just buying gas. For a year, we both pay our bills on time, but he only pays the $21.75 minimum, while I pay my card in full. At the end of the year he'll still have a balance of $1352, while I'll have a $0 balance. He will have paid $154.47 in interest, while I will have paid $0 in interest because I paid in full each month. At the end of the that year we decide to evaluate our scores, and we discover that my score is way better than his. Why is that? Well credit scores are determined my a bunch of different factors: Payment history (35%), amount owed (30%), length of credit history (%15), new credit (%10), and typed of credit (%10). Every one of these factors will be the same for us except for the amount owed (debt-to-credit). His debt-to-credit ratio will be about 90%! (1352/1500) That ratio is a very high! While mine will be 0%. Since the amount owed makes up a large portion of the credit score, mine will naturally be higher. The whole point of this is to show you that making large purchase in order to raise your credit score isn't as good as an idea as a person would think. You're better off making small purchases, or purchases for which you actually have the money for, and paying off the full balance each month.
If you're hell bent on doing this, we can't stop you, so I would suggest finding a card with a 6-month to 1-year 0% APR promotion. That way you don't pay any interest on the purchase and can set a goal for yourself to have the laptop paid off in full before the promotion is over. Even then it's still not a good idea to do that because you'll never know what can happen down the road. You could run into some money issues and you'll be stuck with a laptop and a lot of debt.
I personally have the "Citi® Dividend Platinum Select® Visa® Card for College Students." I get a certain amount of cash back every time I use the card, and after I accumulate enough dividends ($50 minimum) I can request a check. The APR is 13.99% variable, which is pretty high, but I never carry a balance, so that doesn't really matter to me.
If I was you, here are the things I would look for:
No Annual Fees! CC companies make enough off of us already, there's no point in paying them to use their card.
The lowest APR you can find. As a newcomer you probably won't get anything good right off the bat, but look for the lowest APR you can find, which also includes balance transfers, cash advances, etc.
Some kind of reward. CC companies have a bunch of cards with a bunch of rewards, so why not reap the benefits?
MasterCard or Visa? I personally have a Visa, but that's because my debit card has a MasterCard logo on it, so I can use MasterCard if a place doesn't accept Visa (like my university). If you already have a debit card and it has some sort of CC logo on it, I would go with a different CC company.
Wow, I just typed a novel! I hope that helps you, or at least someone.