I picked up a 5 pack of the Pony power cars and one of them is a WL. The Black classic Mustang. After looking at it I realized I do like te other cars but I'm not in love with the set. I want to open and play with the other car but I assume this will reduce the value correct? What would the value of the set as a whole be? I don't see those sets listed on LL and I think I want to trade it away for somethin more interesting to me.