Earlier in the year, I had built a mining rig for my father-in-law as a science project, but when Ethereum started tanking, he started having second thoughts as the electricity costs started outpacing the yield and wanted to get rid of it.
At the same time he had been considering replacing an old 2011 iMac that had been on it's last legs, so I had the idea of cannibalizing some of the parts from the rig to build a system that he could use to replace his iMac. His main use would be photo editing, browsing and some light office usage. His main concern is that it would be compact, low-maintenance, but lightning quick.
The parts that were re-used from the rig was the Motherboard, power supply, Ram, GPU and case fans. I got all of the other parts from microcenter, and decided to go with the i7 since it was on sale, and pick up the CPU cooler, case, storage and keyboard.