I'm some decent deals going on I'm looking to add on an additional internal SSD hard drive as well as some memory to my Z370-E. I'm trying to avoid any significant performance hit so I'm not sure I was another 960 on the motherboard.

Currently, I have on the PC is.

G.SKILL 16GB (2 x 8GB) TridentZ Series DDR4 PC4-32000 4000MHz 288-Pin Desktop Memory Model F4-4000C19D-16GTZKW
Samsung 960 EVO 500GB Solid State Drive (MZ-V6E500BW) m.2 NVMe

Any recommendations?