But if you just want something Ubuntu-based that A: actually works out of the box, and B: isn't Ubuntu, then take a look at these:
Elementary OS
Xubuntu
Kubuntu
Elementary OS: Pretty, looks like I'd enjoy using it.
Xubuntu: For lighter systems, not for me.
Kubuntu: Sorta like Xubuntu, still, it's a clone of Ubuntu with a different purpose.
What I mean by Ubuntu based is a distro that uses Ubuntu in its source-code, or otherwise just uses it and a few packages. Those Ubuntu distros you recommended are clones with a different purpose, like for lighter systems, education, etc... (just listing examples).