My office recently was broke into, so in the aftermath, I'm thinking of how to better secure computers. (The thieves literally hacked open doors.) I think the older Mac Pros with its large enclosure handles could be easily secured with a thicker cable or even chain looping through it, as opposed to depending on those little keyed cable lock slots - which strike me as very flimsy. Can the MacPro be secured in this way? If a Mac Pro is viable security-wise, how about the performance of a computer that's at least 18 months old? Is such a buy a "good" buy? Thanks.