My List
Just my 2 cents, I disabled the following without problems:
-Account Manager
-Email
-Exchange Services
-facebook
-Filme (Movies)
-Google Play Books
-Google Play Games
-Google Play Magazines
-Google Play Movies
-Google Play Music
-Google+
-Hangouts
-Kalender (Calendar)
-Playstation Mobile
-Social Live
-Socialife
-Sony Select
-Support
-Walkman
-Walkman
-Xperia Calendar Sync
-Xperia Friends' Music
-Xperia Music Likes
-Xperia Social Engine Photos
-Xperia Social Engine Sharing
-Xperia Lounge
-Xperia with Facebook
I use alternative Apps e.g for Calendar -> aCalendar+, Walkman -> Poweramp,....
Cheers