The final additional bonus (for me) would be the time I can spend with my children because I chose to not build a system for me.
Exactly. I used to build my own PC's in over the top overclocked to the hilt style and while it was fun for a while, it is all consuming and you end up spending more time building, endlessly upgrading, testing and benching to the point that you barely have any time left to actually use it for what it is intended for. Mac pro came to the rescue for me and I'm not looking back, but I am anxiously waiting to up my 2008 quad to at least a 2010 3.3 6 core setup.