Oh, I was going to mention that if you love classic Estes and Centuri kits, check out Semroc's laser cut fin selection at:
https://www.semroc.com/Store/scripts/prodList.asp?idCategory=64
There are a lot more fins that have been added that are not part of released Semroc kits. Cherokee-D, Orbital Transport, Sprite, Black Widow, Long Tom, Mercury Redstone, Centuri Quasar... . Check it out. Carl had said a while ago that he wanted to have laser cut fins available for every classic kit. Even if he doesn't reach that goal, there is still a huge selection of kits that one can clone with Semroc parts.
I think I see a build queue that is growing out toward 2018.