For Usagi's Japanese voice I vote for both Kotono Mitsuishi and Kae Araki because the both of them did a very amazing job voicing Usagi. Now as for Usagi's English voice I vote for Stephanie Sheh because she sounds just like both Kotono and Kae, plus I really love how she voices Usagi too.
That's awesome and Cowboy Bebop is a very amazing series. That's very cool that your sister got you into liking Sailor Moon and the anime series you mentioned called Akazukin Chacha sounds like a very interesting series.
In my honest opinion Ryo is the perfect boyfriend for Ami and I'm so disappointed that he didn't appear in anymore seasons of the 90s Anime. I would have love it if he's a canon character in the manga and crystal so that it could it be possible for him and Ami to be together.
The Sailor Moon S movie is my favorite because it is a very heartwarming and romantic film, plus I love that it's the only movie that is based on the manga. I also like the R and SuperS movies as well, but the S movie is my all time favorite out of all of them.