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Capital One most certainly recognizes and rewards high usage, both in terms of CLI and when you open new accounts. I don't know if the same is true of Barclay's. I think a lot of CU's do as well, as they value "relationship banking", but with the cards you have now, focusing spend & PIF your Capital One unsecured card would be the best strategy. In 3-6 months, hit them up for a CLI or apply for a new card that offers higher limits.