I've got a MIMSB Energon Costco Overlord/Optimus Prime set that I'm either going to sell or just open already. But I can't decide.... there's none on ebay or completed auctions except 1 store item that's loose and unsold at $150. So how much you think it's worth? Or think I should keep him and finally bust him out of the package? Maybe opening him won't loose too much value if I do decide later on to sell it off? Thanks for any input!