I agree with the lonegunman, it is better to keep your active accounts as current as possible or they will end up being charge offs like the others, if you keep them current then you are actually building a good credit record on them that may eventually outweigh the delinquent ones.
Have you pulled your credit report, charge offs never really go away, even after you pay them off you will still see them as charge offs on your credit report, they will just go to a settled or as settled, they will still show charged off/paid off. They never take that status off your credit report, even if they promise you that will happen.
One thing that you will want to beware of, a lot of companies are now suing for smaller debts these days. If you read through this forum and the credit forum you will see several individuals being sued for the smaller amounts that creditors or collectors would not have sued for in the past.
Be aware also that the company may have reported the amount they charged off to the irs under your name, this is considered a gain to you and will be filed as misc. income. If you don't hear from the irs this year, you will in a few years to come, they seem to always catch it.
Goodluck, hope you find a solution that you are looking for, please keep the forum update, someone else may come along in your shoes and read the post and learn from it.