Grey grads are best with the Cokin filter type of arrangement so you can move the filter up or down to suit the composition which you can't do with the screw on type. You have at least got the holders to take a slide in filter so I would keep the appropriate holder. The other filters, apart from the polarising, have little use to my mind as their effects can be done in PP just as well. I would get any pennies you can with them.
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