Look at the steepness of the bug-count for the next release (green curve) at Debian. Even as the count of packages in the repository rises, the rate at which bugs are getting killed in the release-cycle keeps rising. This shows the power of FLOSS. By using a modular layered approach, a thousand people can change the world faster than tens of thousands working in the darkness of M$. It’s beautiful that you can have the benefits of a package manager that keeps all your systems updated for applications as well as the OS at very low cost. I recommend Debian GNU/Linux. It works for you.
At this rate, Debian may well release “Wheezy” (30K+ packages and everything needed to manage them) before “8”: