I've been a a hard-core upgrade addict years ago, and that didn't change in the time since then. On the contrary, I've become allergic to outdated software, and I chose the distributions I'm using with particular attention to their closeness to the bleeding edge. I thus run Arch Linux on my desktop, Fedora on my office computer, and OpenSuse on my notebook.
OpenSuse? Bleeding edge?
Well, see for yourself:
With the tumbleweed repository, OpenSuse turns into a really very much up-to-date rolling-release distribution. Definitely worth a try.