Hmm... Off the top of my head, the K kits I flew back during my first go-round (I first flew in high school in '73 and '74) would have been the Alpha, WAC Corporal, V2, Skyhook, Mark II, and Trident. As a BAR, I've added a couple clones including the Ranger and Sprint. I've built an X-Ray and a couple others, but haven't flown them yet.

What about the TK series? Of those, I'd add in the Birdie, Mini Bomarc and Mosquito.

I got a lot of rockets to build and fly! ;p