I've got it running!!!! First I tried installing the Debian client off ownCloud's page by ediiting my sources.list. It was pretty ugly (I had no problem doing it for my Ubuntu laptop and netbook - but there might be issues with armhf maybe?). I then removed my sources.list for owncloud and simply installed from Debian sources. No love at all. I kept getting errors trying to connect to my server, because the Debian version is 1.7.x and you need > 2.x to connect to a newer owncloud server.
The part that worked! Install owncloud-client from Debian backports. That gets you a fully working client with gui, which is happily synching my Documents, Music, Pictures and Videos directories to my phone. It didn't work at first, but after a reboot it's working. Not sure why, as I normally never reboot - but it is working and synching more than 18 gigs of stuff and things.
apt-get -t jessie-backports install owncloud-client - did the trick!
I haven't tried KeePass2 yet. That's next on my list.