[Ryu Kazama]

The AC set includes Sephiroth, Aerith, Vincent and Cloud. Cloud was released with the Fenrir bike and separately on his own. The second set consists of Yuffie, Kadaj and Reno. There's also Bahamut Sin, Creeper (?) and Highwind or whatever it's new name was. ALSO, smaller mechanical arts that were ShinRa bikes and a small scale Fenrir (don't see this around often).

As for the Koto statues linked above, they're not too expensive. £50 or so for each one. The first editions are likely to set you back much further though. Only difference between them is first edition was made many years earlier and came with a serial card, second run didn't. Back of the box may also be slightly different.

They did some really nice FFVIII and X statues too actually but prices can vary for them but you're guaranteed to pay a fair bit for Lulu and Rikku and, if you get super lucky, Wedding Yuna. Kimhari is usually the cheaper of the FFX bunch.

Edit: Also to note, the Cloud that comes with the Advent Pieces is slightly different. They redid his head and arms for the separate release. These parts were also sold separately for those that wanted to swap them. The box is totally different, too of course. The set is pretty rad if mainly because of the special printing of the game. I own 2 sets but sadly both outer boxes were damaged (common issue).