I'm very interested in a Mac PRO machine but the current iMac Pro is no good in my opinion, at least for my needs.
How on earth no one mentioned the downside of having an AMD graphic card in this thread.
There is absolutely no way I would go for AMD over Nvidia anyday. Most of my rendering apps rely heavily on GPU and CUDA is a must on almost all of them.
OpenCL is Ok but still a long way to go. The ability to use both CPU and GPU in rendering is a must nowadays. Only CUDA is supported in most of the professional apps available. Very few support OpenCL but then again the CUDA performs much better. One of the reasons why I'm stuck with a maxed out 2013 imac with a GTX780m....
Interestingly enough, that build goes far above and beyond what any iMac can offer at that price with 4 internal drives, a 16 core CPU, BR/DVD/CD writer.
When the Mac Pro comes out, instead of spending $3,785, Apple will charge $10,000-$12,000.