My answer would be … which one?
At home, I have:
an HP Microserver N40L running Ubuntu 12.04 LTS with 2TB of internal RAID1, which backs up configs and key files from around my network (using rsnapshot), as well as acting as an SSH ingress point for one of my FTTC lines
a shitbox Zoostorm thing running ESXi 5.0, with a bunch of 12.04 VMs doing various things (pfsense router for both my FTTC lines and IPv6 tunnel, general purpose shell box plus ingress for my other FTTC line, DHCP/DNS/IRC-proxy box, Plex Media Server box, an ancient IMAP store that has gone from 8.04 to 12.04 via 10.04, and a system config orchestrator/DNS box) and the VM datastore mounted over iSCSI from a Synology NAS
a Mac mini with some local storage as my living room media centre (OS X + Plex Home Theatre)
2 Netgear ReadyNAS NV boxes (one an NV+, the other an NV+v2) each with 5.5TB usable in RAID5/XRAID config, with data and homedirs being mounted by clients over NFS and AFP
I also have a dedicated server in London acting as my primary SMTP/IMAP store, web server and primary external DNS; dedicated server in Roubaix, France, doing some media related shenanigans and secondary DNS; a VM in New Jersey acting as secondary DNS. They’re all running 12.04.
I’m probably going to ding the VM for a couple of Digital Ocean instances (in SF and AMS, most likely) to do DNS and geographic breakout. I tried doing this with t1.micro AWS instances, but it was too expensive.
… you did ask