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Opening a new cc with always lower your AAoA (which is a bad thing). However, a new card will also lower your %utilization (a good thing). As you are young my guess is that your average age of accounts is still quite low. THerefore a new account will not have much effect on that. You will get a ding for "searching for new credit" which will last one year. At your age I would not worry about it too much. In a couple of years you will have some nicely aged accounts and scores to make us all jealous.
If I may ask what other credit cards do you have? Are any carrying a balance?
Target Visa Credit Card - Limit of $5,500 - Balance of $0
Discover Credit Card - Limit of $2,000 - Balance of $0
Dell Credit Card - Limit of $2,000 - Balance of $0
HSBC Motorcycle Credit Card- Limit of $14,000 - Balance of $9,000
I just paid off my 2005 Toyota Corolla 2 weeks ago.
I have a total credit card limit of $23,500 and using $9,000. So 38% Utilization.
My motorcycle is on the HSBC credit card 5.99%. I am paying it off in $600/month and will be paid off April 2010.
AAoA is average age of accounts. Your motorcycle will not "replace" your car loan since it is revolving credit (on a CC0 and not a true installment loan (like a car or student loan). Your scores will suffer a bit because utilization on installment loans is not that important, but it is very important on revolving debt like credit cards. You will likely see a big jump in credit score when your % utilization gets below 9% or so.
If you have not already I would read the thread on "credit scoring 101" and "common abbreviations" both of which are at the top of the main page under commonly requested threads.
CHeers