Actually, I want the original offensive CM set removed and replaced with this. It's obvious that if you're going an attacking route, Celebi really, really needs the power of Nasty Plot (it's been emphasized in this thread that base 100 special attack isn't all that great), so a defensively oriented set plays significantly more to Calm Mind's strengths.
While we're at it, I want to bring up merging the Nasty Plot sets into the following set:
[SET]
name: Nasty Plot
move 1: Nasty Plot
move 2: Psychic / Recover
move 3: Grass Knot / Recover
move 4: Earth Power / Hidden Power Fire
item: Life Orb / Leftovers
evs: 4 HP / 252 SpA / 252 Spe
nature: Timid
AC would mention moving 116 Speed EVs to HP along with Recover and Leftovers for a bulkier version of the set. It'd also mention Occa Berry alongside Earth Power for toasting Heatran. Energy Ball would also be mentioned as a more "reliable" attack, since there are Pokemon like Vaporeon and the Pixies that can fuck up a set using only Grass Knot.
The end result is that instead of having:
Offensive NP
Defensive NP (?)
Offensive CM
Defensive CM
We'd just have:
Nasty Plot (offensive, bulkier "balanced" version in ac)
Calm Mind (defensive)
Makes sense to me, and also tends to reduce the clutter in the analysis (celebi has a fuckton of sets).