Withdraw from the card or from your account? If you close the account (ie. withdraw your money) you will have VERY harsh penalties. And if you spend the 5K.. Well, You now owe them 5K plus interest, plus over the limit fees, (because they will have a monthly fee on top of your finance fees), AND a new APR somewhere around 28.9%.
Your best bet for something like this is to get a CD for 5K... Then get a secured loan against the CD.. The finance rate will be between 1and 2% of what you are gaining from the CD.
There are a lot of good things about this, here are a couple.
1. If you set it up on an automatic payment, they cut the finance fees.
2. Most banks report payment on this loan to credit agencies, hence, building credit FAST. This shows possible credit vendors that a) you have something to loan against, and B) you pay on time.
Good Luck,
Dustin