actually, after doing a "build your own" comparison of my own (which i know, is NOT corporate friendly, nor would i ever recommend to those who aren't comfortable doing themselves).
but i did it for my own "***** and giggles"
All the system builders put a hefty premium on Workstation grade systems. Apple, HP, Dell. Doesn't matter who. There is going to be a significantly large markup compared to everyone else.
What else also is noticable is that some of the parts of the Apple's nMP are actually good deals and some of the ugprades are horrendous deals.
For example: the upgrade from 12 to 16gb ram is $400. this is done via adding 1 stick of memory. (3x4gb v 4x4gb). Currently the price for 1 stick of 1866mhz DDR3 ECC ram on Newegg.ca (yes, even in Canadian prices) is $80. Making the upgrade cost for 16GB v 12GB completely and utterly a rip off.
yet, the upgrade price for the 32gb version is much Much closer in price!
similar went for the other manufacturers.
its just very inconsistent that its really hard to say what is a good deal or not