You're probably going to get a few different answers to this - none are wrong - just different. If it were mine, the first thing I would do is to go throught the set and try to upgrade your other set if possible (if you haven't already). Then, I would buy the missing cards (and replace any trash cards) to complete the set, and then sell it as a complete set.
If you decide to complete it, let me know. I have a buddy that has many mid grade commons.
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