Save money on 32GB or 64GB OWC memory (about $400 savings vs Apple!)
The rocking fast 1TB flash drive in the late 2015 iMac 5K absolutely trounces the 2013 Mac Pro on a real-world test that is I/O bound.
Wow. I want one of these flash drives in my Mac Pro. Between IntegrityChecker and 'git', this fast flash drive makes a huge difference.