I would actually go chronics, I know a guy that rode chronics as his first park ski and his progression was phenominal. Masterminds are very soft flexing and from what I've heard their durability is questionable. Chronics are undeniably stiffer with a more snapy flex, when I rode them I felt they weren't horribly stiif I could still butter the flex felt perfect with a lot of pop, they were light and playful just how I like it. Considering they had been out all season the durability seemed good.
Hope this helps, Joey