I finally finished watching Kamen Rider Ryuki today! I really liked it, although I think I missed a bunch of exposition in various places. (Also, the ending was super sad before the reset. Seriously, I was kind of crying from the end of episode 49 all the way until the end of 50.) The next Kamen Rider series I watch will be Hibiki, and then I only have to watch Blade and Agito before I can watch Decade! I've only watched half of Kuuga, but I don't feel like watching the other half enough to worry very much about spoilers.