I'm mid-switch back to OpenBSD. If you have the luxury of picking supported hardware, it's actually a pretty awesome experience--just like I remember from a decade ago, but with incremental improvements and up-to-date packages that are a snap to install.
In the early days (Slackware 2.0 onwards) I used to test every distro and windows manager, eventually I got tired of it.
Nowadays I tend to use Windows on my main laptop and Ubuntu does everything I need on VMs and my travel laptop, without spending time messing with configurations.
Of the ones I've tried recently, I liked manjaro a lot. It's based on Arch, so you get cutting-edge software, access to the AUR (really great) and good default configuration (with vanilla arch you have to set up everything yourself). It has the standard DE's, I used xfce. You might want to check out Korora, it also looks pretty cool.
DE-wise, KDE's Plasma5 and LXQt both look pretty cool, though not many distros have them yet.
+1 on Manjaro. I used Ubuntu but got sick of their changing the UI EVERY couple years. Switched to Manjaro 6 months ago & it's soo much better. No crazy shit like Ubuntu's forked kernel (they had to backport Intel's BDW gfx driver recently). Just plain upstream packages nicely configured to install. As a dev it's wonderful.
I need something that just works for the parents. (Since Unity, Ubuntu has been on a constant slow slide downwards usability-wise.) I tried Mint on a recommendation, but their idea of an upgrade was a re-install (really!), so that was a no-go. Any other ideas?
Mint is good. Cinnamon is pretty, but occasionally has problems that I don't see since I swapped to XFCE (it randomly started hogging the CPU, I never worked out why).
Manjaro needed a few more tweaks to get things working at first, but I have had less problems afterwards.
Agree with Mint. Its Cinnamon experience is excellent and, if it turns out you're not a fan, it's just Ubuntu: you can switch to any of the other desktops without reinstalling.
Yeah, but I find the Mint experience often more polished vs Ubuntu. In Ubuntu (at least in previous versions) there was always a bug somewhere that annoyed me, in Mint it's almost flawless.
I used to be a distro geek, test all kinds of various ones, various window manager, twiddle driver settings and all.
Now just use Ubuntu for the last 7 years and like it. It just lets me get the work done.