Can I leave my mac on for many days with Anti-Theft software enabled?

[Soulstorm]

I am preparing for a trip for two weeks, and I must leave my iMac in my house, so I am looking for anti-theft software solutions.

I am currently looking into Undercover. I have also looked at Prey, but I want undercover, since it's one time for many devices, and I have more than one mac. I also saw Witness, from orbicule which uses the Mac's camera to notify you if anything happens inside the room. However, I don't think that leaving my Mac with the camera open for two weeks is going to be good for the machine...

I am currently thinking if it's safe to leave my mac open with Witness enabled, so that I can know what's happening inside the house, and if anyone enters.

An alternative solution is to use iTeleport (which I currently own) to check if everything is OK by waking up the computer at periodic intervals (I have seen that iTeleport can do that, but I don't know if it will be able to wake up the computer every time).

Is there anyone who has any thoughts on which solution is best?