Look at this work up I did. The entry level iMac Pro would be 8 cores with a 1TB SSD (assume PCIe) http://minireplacement.com/monster-build/ I could only come within $325 under the entry level iMac Pro, and I am sure I am missing something. The motherboard is a guess. The new X299 motherboards are not out yet, and they may be pricier than I guess-timated. Plus the iMac Pro promises 4 Thunderbolt 3 ports. The Speakers on the Monster Build would be better than iMac speakers, but the webcam would have to be external and on the top of the monitor. NOT good. The Monitor itself is roughly near the quality of the iMac monitor But I had to guess-timate on the Graphics card, and the motherboard. And it would lack the Apple esthetic, though it would certainly be upgradeable in a way that Apple Products are not, now. So the question is: Will Apple still allow self upgrades in RAM in the iMac and iMac Pro as they have in the past? It looks like the horrific $4999.99 entry price of the iMac Pro is actually reasonable.