Managing eclipse procs will give a decent dps increase.

(Fursphere also wrote a detailed account of how he handled single moonkin eclipse procs so it's worth searching for that thread)

Don't underestimate the usage of starfall and hurricane on multimob packs (you really need to know your tank can hold multimob aggro).

If you want to see specific numbers take your moonkin to some target dummies. Try your normal rotation, then try it again with eclipse procs. Do a good few minutes testing.