Hmm. There's the CalDAV Sync and CardDAV Sync programs that I've been using with my own davical install for a while. Email still needs to be migrated away from Google, but that's a larger issue than the Andriod side but K-9 is fine with IMAP sync. These apps work with my Incredible which is going on 3 years old now (though I now have/use a Galaxy Nexus).