My guild is requesting that we make "wishlists" with what gear we want from the current 25- man instances. However, I'm having difficulty finding any updated spreadsheets or simulators for Moonkin DPS. Does anyone know of any or have any advice?

is Rawr any good for this ?

I have used Max DPS for my hunter ... not sure how accurate is the Moonkin gear rating. MaxDPS (http://maxdps.com/druid/moonkin.php)

I would be very careful about using MaxDPS, I can't say specifically for druids, but I know for my Mage and Hunter they used some funky weighting that just wasn't accurate. Perhaps it was just my playstyle conflicting with their methodology but in the end I found that many peices they considered upgrades were not, or were side grades at best. Also MaxDPS likes to use "cookie-cutter" builds/assumed cast rotations, which is a very dangerous assuption for most players.