COSMIC seems cool, though I don't love the visual style myself. Someone I know who used it ran into the problem that it mounts network shares using a mount unit, which is good, but it doesn't add nofail, which is really really bad, because it means you hang at boot waiting for it to mount. I'm sure they'll figure this out, but I really have been wondering where to report this issue specifically; it's hard because I don't know where it actually exists in the code (and I couldn't find it quickly.)