Manjaro, it is based on Arch but it is a completely independent distro that keeps its own repositories. It is very easy to use, Kladiator mentioned considering to use it on his main computer after testing it. It does not require a lot of knowledge before use as there are GUI tools for just about everything.
The only important thing to know about rolling-release distros is that you have to remember to keep your system up to date. You never have to reinstall a new version of the OS, but you need to ideally update once per week so you don't lag too far behind. More frequent updates is just a plus on rolling release (I update daily, sometimes several times per day if there are a lot of updated packages).