Recently, I stumbled on an arrangement of Final Fantasy X's "To Zanarkand" that, although essentially the same, had more emotion and power to it.
My random guess is that this song is part of the fabled "Piano Collection."

Needless to say, I'd like to get my hands on this version of the song.

Thanks in advance.

-Cheers.

Would it be possible that one of these is the one you're looking for? (scroll down; they're downloads)

Here. (http://www.midishrine.com/index.php?inst=piano)

Actually, yes it is! Thank you very much!

You're very welcome! :)