If you like to have a package system that's consistent and easy to use, try something that's
Debian based (I'm definitely biased in that respect - actually, you should also try other distros/distro families; specifically, for learning, everything
Slackware is worth looking into - which includes
Zenwalk,
Wolvix etc.). If learning and experimenting are the main purposes, I stick to my recommendations of
Finnix (mainly as a bare-bones live CD that is useful in a lot of standard cases but can also be installed) or
grml (a distro for CLI lovers with loads of tools that also sports a minimal
X environment); if you want a good installer, use
Debian proper or
sidux (the latter provides a usable version of bleeding edge
Debian Sid (
unstable) and doubles as a great live CD) and uses sophisticated CLI tools that give you a lot of insight about the system).
IMHO, package management via
dpkg/
apt-get is the main reason for sticking to
Debian based systems; you can either install a minimal
Debian and work from there or use something like
grml (with powerful CLI tools) or
sidux (bleeding edge, clever use of bare-nuckles technology) to get to know the system. Both
grml and
sidux come as fully usable live CDs,
Debian provides a live CD via the
Debian live project.
M.