My workstation is running openSUSE (version 13.2 -- I use this version because I prefer KDE v4 branch and do not like the later KDE / Plasma5 interface -- KDE4 is a pain to install on newer distributions and most distributions are now ditching the v4 branch in favour of the newer version, therefore until there is a fork for KDE4, I am not intending to upgrade my workstation OS).
Like most sysadmins, I spend a lot of time either within a web browser (using Firefox for NS, CPanel, Webmin and other web based interfaces) or within bash and SSH based terminal session (mainly using Links2, Midnight Commander and Vim).
I do have a few Virtualbox sessions on my workstation with various operating systems installed (MS Win XP, MS Win7, Intel based Android, ReactOS and a few other systems).
I also do have a couple of other real computers that are on my LAN that I use as development environments and various network monitoring / backup / infrastructure tools (as well as some KVM / Qemu based VMs -- generally used to test various firewall and other infrastructure based distributions).
At the moment I am porting some of my services (and creating some new services) to a VPS hosting provider that is based within Italy.