Like you, I was recently distro (and DE) hopping too, and I tried most of the distros you mentioned. Manjaro has majority of my attention as a secondary distro, but it still has some work to be done before it can truly be considered a "final release", unlike now where it is very much beta. Fedora is nice but I found my wifi card breaking a lot with them, so I moved on. OpenSUSE is another that I consider to be pretty much awesome. I tried the Gnome port on all of these distros and found it to be pretty well rounded. I like newer paradigms, so for me it was Unity, Gnome, or KDE with the Homerun launcher, but for reasons that I will generalize as the "lengthy list of usual suspects", I found myself choosing Gnome as the most sane yet usable option for what I need. Just my 2c, but figured I'd offer it while it sounded like you were hashing out distros.
I might end up running Crunchbang on my netbook, as that machine is just so dang poor in terms of hardware. That, or maybe even Slitaz. Hmm... might be on to something.
Good luck with your choice!