I don't know if you are like me, but when I'm gone for any length of time, I will continually have thoughts of the system overflowing, catching fire, running out of water, you name it, it would cross my mind until I get back.
To help rid myself of this, I set up a small web-cam (cheap, no need for craziness here) just to see how things are going. And in the event something did go wrong, I had a friend with a key that could drop by.
The reality of the fact is that it still has MANY hours of possible bad things going on, but no more so than while I"m at the office. It just let's me acclimate to the fear.
Depending on your tech savvy, you can go an initially cheaper route and leave a computer on with a remote desktop connection available (if it's a modern laptop, chances are it's got a camera in it already).
Of if you really want a small foot print and much lower power consumption you can take a look at a stand alone unit like some of these. After 2 months of desktop power consumption, you might equal the cost of having bought one of these.
-t