Oh my God, you're asking me to choose?
I do think that Final Fantasy 7 was one of the best. The storyline was surprisingly thought out, considering it came from Squaresoft. There was a good mix of humor, and wanking, which made the slow parts bearable, and the characters didn't make me want to beat my head off the wall. :coughFFXcough:
BUT I think the only reason Sephiroth could pull off the long hair was because he had that Masamune. Would *you* tell a man with a seven-foot sword his hair makes him look gay?
Others that were almost equally awesome: FF 6, 8, 9 (Kuja, and his codpiece, man) and 10. I'm fully convinced that FFX-2 was an apology to the fanboys for Kuja, and that Kingdom Hearts 2 was an apology to the fangirls for FFX-2.