You don't want to close out the highest interest cards if those are your longest standing cards - that's closing a big piece of credit history which will harm your credit as far as I know...
I'm not a complete nub at this stuff - I have a 770+ score for a reason. I just have a lot of stuff opened up over the years that I don't know whether to close or not. I think I have too much 'available' credit to me which is harming my score.
Of course I'm not going to close anything not paid off either :P
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Yamaha YZR-M1
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glass on glass bong
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vaporizers
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CAPRI