The one I use the most is probably rikku's Mix (light curtain + light curtain )

yuna's is the most useless except in boss fights.

It didnt take that long to get wakka's soverdrive because the time I bothered wanting them, I was playing a ton of blitzball anyways so xD

I don't like using lulu's because i can't really get good results with them xD

Auron is hot.