General :: Universal Music Syncing?

need a way to sync/listen to music to 2 Android devices and multiple PCs and trying to get the following functions:

1.) Ability to upload all songs to cloud
2.) Ability to listen to everything in the cloud or set some as "Offline" on mobile devices and laptops
3.) Ability to create playlists that stay synced( meaning if I add or remove a song on mobile it shows on desktop, all changes synced everywhere )
4.) Ability to rate songs from 1 - 5 ( much like iTunes, MediaMonkey, etc... )
5.) And this is the big one! The ability to create Smart Playlists like on iTunes based on Ratings that stay synced everywhere( Changing rating on mobile changes everywhere )

I think I've found all of the above in most services except 4 and 5. I cannot find a service that allows detailed ratings( 1 - 5, not Google Music's thumb up or down( how useless is that ) ) and also couldn't find smart playlist functionality anywhere.

I need ratings and smart playlists, and the only other option I can think of is moving my music to Dropbox, installing Media Monkey so it looks at Dropbox for ratings and smart playlists( or views, whatever they call it ). But this leaves me out of luck on mobile devices.

I'd like to use Google Music but it doesn't have the rating / playlist stuff, non of them do, well not smart playlists anyways.