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From what I've gathered from my research from these boards and over the Internet, I've learned (correct me if I'm wrong, anyone), that it doesn't matter what your credit limits are, it's the utilization that's most important.
And also that if you have multiple credit cards, for optimal scoring they should all have a zero balance, except for one, and that one should have less than 10% utilization.
(So each of your cards shouldn't have a balance with only 10% or less utilization, it's your utilization as to your entire credit available from all your revolving accounts.)