I think a nano would be nice at your office. However, instead of being easier, sometimes nanos can be more difficult because there is such a small water volume. That means that there is smaller space for you to make an error.
Honestly? Depending on how busy u are and whether or not u have time to mess with it. Once everything is up and running smoothly.( Which can take awhile ) the BioCubes r pretty nice and somewhat trouble free except for the regular Maint. I suggest purchasing the tank and buying the upgrades simultaneously. Pump, filter basket with Chemipure Elite and Purigen media. Some modification is required. But it's pretty basic and simple. U can get all the help needed here on AA. I have a Bio14 that I like very much. But I hear much praise on the BioCube 29