'84 and '85 USFL sets, what do they go for?

I have an '84 and '85 USFL set that I'm considering letting go, and was wondering what they are worth nowadays. Would it be best to sell the set as a whole raw, or sell the set with the key cards graded?
I used to be into sport cards, but the glut of the '90's drove me away from them, and I'm now selling all my cards that I didn't have as a child.
I used to be into sport cards, but the glut of the '90's drove me away from them, and I'm now selling all my cards that I didn't have as a child.
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