I finally upgraded my over summer and Christmas.
Got rid of my 980GTX's and replaced them with EVGA 1080GTX's (kept the SLI bridge)
And got a Z370 MOBO with an i7-8700K rather than my old i7-975EE.
My 64GB of DDR3 1800 was replaced with 16GB of DDR4 3000.
Swapped out my 128 GB Kingston SSD with the Samsung V-NAND 850 EVO 1TB.
I still have my 1TB SSD/7200 hybrid, but I've added a WD-RED 4TB and a Seagate 2TB 7200 HDD since then.
Also swapped out my old Antec 902 tower with a Rosewill Midnight Edition. (Couldn't stand not having USB 3.0 on the front, and it was 80% at the time)