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the amount is pretty much irrelevant, a charge off is considered a charge off whether for $100 or $10,000.....
as they age they impact your score less and less, but they will hurt you until they are gone.
A paid charge off will always look better to a manual review than an unpaid charge off, so it's up to you if you think it is worth paying them off or not.
For such small amounts, I would be trying to PFD and get them off my reports.. just my .02
Your best bet is to just call and ask them, if they agree ask for it in writing before you send payment. Good Luck!!!