Since the one I built in 2010 just had an operating system crash (i7-930 oc @ 4 ghz, 12 gb ram, 4 1tb data drives in raid 10) I had to go through getting that one up and running again.
I also built a new one, and so far I'm really loving it.
i7-7700k & 4.2Ghz
32GB of DDR4 ram
2 M.2 2280 500Gb SSD's running mirrored for the operating system, software (just Lr and Ps), with Lr catalog, previews, etc. on the drive as well.
1 120GB Sata SSD doing nothing but ACR cache and Ps scratch disk
4 2TB WD Gold Series running in raid 10 for image storage
Nvidia GTX1060 video card
NEC PA272 wide gamut monitor
For my purposes this system is blazingly fast. I'm getting 3400MB/sec sequential reads, and about 2500MB/sec random reads from the operating system drive.
The other system I'm re-purposing for running office, and other assorted software, as well as an additonal back-up location on top of external drives, NAS, and cloud.