Is this a good win on EBAY?

I won a 1980-81 O-Pee-Chee Hockey Set(Messier RC and Bourque RC, Gretzky 2nd Year)("near-mint") for $262. According to Tuff Stuff, it's worth $625 but I know, sometimes Tuff Stuff prices are inflated. Should I,(a) resell it for $400,$500,$600?,(b) keep it, it could be worth more in the future or(c) stick to my game plan on ebay, sell for 10% higher than my final cost to buy it??
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mosaic's Nolan Ryan Basic Topps registry set
mosaic's Big 3 Nolan Ryan Run Showcase
You mind me asking what the '79 set you back?
I just busted two rack boxes and three vending.
Should probably sell off the doubles.