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What about FreeBSD? I know it isn't a Linux distro. It's stable and speedy. Many enterprises are using it and getting uptime records. Just visit www.netcraft.com
I also think Slackware is a good choice; It's probably the fastest and most secure Linux distro. Funnly enough, it has less bugs and more up-to-date packages than Debian. apt-get is a nice tool but Debian is a sort of nightmare. dselect, many questions when updating packages, etc. Debian stable could be OK for servers. But I think there are better choices. If you want less bugs and more speed, try FreeBSD.