Best voices I've concluded are:
Vincent - Steven jay Blum mothersmurfers.
Cecil - Yuri Lowenthal bitches.

Profanity is the only way to summarize their awesome.

Seriously though I love their work in general and they did a great job in FF.

Can I also just give an honorable mention to Seymour? It's true his voice was annoying as hell sometimes but in some scenes he just rocked I thought. like when he's run through by Kimahri.
"Unpleasant."
YouTube - Final Fantasy X Playthrough (107) Before Seymour Natus