Kiva, Decade, and W. Foruze's sound track is pretty decent too.

Decade has the best OST, for sure, but Agito has, like, the best ending theme ever, you know which one I mean.

Kiva had an outstanding soundtrack in my opinion. Violins and guitars made into an intense combo.

The first Kamen Rider, bar none. Still has the best opening and battle themes.

Well, just for songs with vocals its between OOO and kiva, i especially love reverse/re:birth and fight for justice but double and decade have some great music too, as does fourze, i cant pick just one

OOO's is good for me,but my favorite will always be Decade,for one reason and one reason only.....

http://www.youtube.com/watch?v=N2XKy...&lf=plpp_video

Kiva and W are the only ones I've listened to as music, ie outside of the tv series.

Ryuki's is interesting, from what I've noticed during the show.

Hibiki is the best OST for me. What really got me into it was that it's really focused on pure music on its own.

I'm going old school.

Kamen Rider V3!

Awesome theme song and great 70s action BGM.

Musice Station - Kamen Rider V3 Homepage