I'm guessing RAM maxes out at 64GB but I'm sure that costs an extra $2k. The fact is, this machine will be impossible to overclock due to the size and cooling capacity. As someone who builds computers I can tell you this is simple physics, unless they are using phase exchangers or liquid hydrogen. I'm guessing a minimum entry price point of $3999. The intel 3930K chip overclocked is faster than the 8 core xeon and currently retails for under $500. See my cinebench scores
http://imgur.com/xMTkacD. You can build a system around that chip for another $600. You could literally have 3 computers that, together, are 4x faster than the iWastebasket for the entry level price, before you do any upgrading to the MP. Let alone lose all your invested stock of pci-e cards, adapters, hard drives, etc.