Mounts for Optoma HD20?

Hi, I recently took advantage of the deal on the Optoma on Woot.com to replace my ancient Sharp Z9000u. I have the mount for that professionally mounted in the ceiling. I was wondering if there's any way I could find a mount for the Optoma that uses the same knuckle bracket? Is that asking too much?

It looks like this:



Barring that, is there a consensus on what's the best ceiling mount for the buck for this particular unit?

Thanks!