First I will say that the previous generation 24/27 inch imac has more than enough computational horse power for what I do. My sole interest in the Mac Pro is in its expandability and upgradability. I recently ran across two used 8 core mac pro's for just under $700.00 US. To me this sounds like an almost steel. My first question is the obvious one. Will a mid 2008 Mac Pro (MA970LL/A or MA765LL/A) run mountain lion? Next, if they will run mountain lion, what is a reasonable price. I ask it knowing that if I get one I will have to upgrade the ram, HD and install a blu ray burner so the total price out of pocket will be more than the current sale price.