I would try SuSE if you want a pretty GUI to work with and an easy updater.
However, Slackware is not far off at all. In fact, I prefer it over every other distro out there. Slackware has a command line updater called SWARET. You can update stuff by typing swaret --update
and then swaret --upgrade
I think there is a GUI front end too if you need.
I would say try Slackware.