Remember how I said I consider Agito the real transition from Showa style to Heisei style? This is what I mean. Kuuga is so Showa in the style, the storytelling, the way the episodes are constructed and the characters are presented, that I hardly consider it a "Heisei Rider" (I mean, following Toei's notion of disregarding Showa and Heisei as actual historical time periods and just considering it style eras). You watch anything from the first to RX, this is KR; bad guys attack, RIDAAAH KIIICK, ride off into the sunset. It makes for some great entertainment, but definitely doesn't make your meta muses itch too much.

Honestly, I think you're stalling on Ryuki because you're building too high expectations of it that it will be the best series ever and thus should be left for the last. :D;; It is a cool series, just be careful not to hype it so much for yourself that you're disappointed it didn't live up to your expectations in the end. Just watch it and enjoy it as the next series in your list. :3