So instead of building a machine that is, "basically the same," as a Mac Pro, you built a machine that suited your needs best. That's great, but you can't compare a workstation like the Mac Pro to something you built, especially when you start throwing prices like "~$800" around while bragging your computer is superior than the previously offered Mac Pro.
Also, if the Xeons are meant to handle full power 24/7 (your words), wouldn't that inherently make them more stable and reliable than consumer desktop processors? After all, it's what they're built for, and it's part of their tolerance spec. If they weren't, why would they be used in servers in the first place? If they weren't, why would Intel even go through all that effort of designing them and marketing them if a consumer desktop processor could do the exact same thing?
Just seems unfair to talk about how your Hackintoshes are so much better and cheaper than the Mac Pros when they're not exactly the same machines. Just because your machine does certain tasks for you better than the Mac Pro can doesn't mean they're comparable, let alone better.