My home data center has far too much enterprise hardware -- especially if you count the ZyXEL GigE switch, which I unfortunately can't recommend for actual enterprises. At work, I've pretty much done everything—mostly Linux and storage; but also Windows, routers/switches, firewalls, Solaris, telephones... still no professional experience with VMS, but maybe that's a good thing.
Products of choice: OpenBSD, FreeBSD, Fedora.
Certifications: GCIA. (Previously RHCE, GSEC)