XDM, SLIM or SDDM

I want to set beautiful login manager. So I try SLIM but I've two "problems". First - on logout (xfce4 session) gtk warning it's show, second - using my personal theme, password char go out from password space.
I try to install LIGHTDM and SDD, so at login I see blank screen.
Can suggest me a login manager (LXDM don't love)? My Slack is installed by default settings.

Thanks!