1) Both modes.
2) Define "finished". To me, finished is completion of all side quests, leveling to max level, obtaining all items possible, stats at max, and of course defeating the final boss at least once on the file. So, to me, I'm not "finished". I've spent at least 50 hours on each file so far.
3) I only haven't bothered messin' around with the Rare Truffles.
4) Yup, yup!
5) Normal: 2, Expert: 3.
6) Hmm... I'd say the beginning 'cause you can beat the heck out of Tidus, Wakka, and Selphie and get rewarded for it!
7) I'd say at (SPOILER)Hollow Bastion when the Keyblade goes to Riku/Ansem.
8) Cid, even though his great sense of humor was greatly toned down. *reminds him of the ol' FF7 days of "Sit down and drink yer goddamn tea!!"*
9) *Votes 1st option*