hdd Hard Drive/M.2 upgrade help

[J_M_O_]

I have a build that I mainly use for plex server, handbrake, and have a hdmi ran to front room tv for watching youtube and stuff. I currently have a 500 GB SSD, OS drive, and 2 HGST Deskstar NAS 4TB hard drives in Raid 0.  My hard drives are full and I want to upgrade. Please provide any constructive criticism you have. BTW i have extra hard drives not in the system I keep everything backed up to.

What I am looking to install:
Quantity        Item

2                   Seagate 16tb HDD Exos    in Raid 0

1                   M.2 - help dont know what to buy, considering 250GB or 500GB

1                  10G NIC    - bought on black friday

Current setup: sorry pc part picker didnt have all items so didnt bother

Motherboard            ASRock Fatal1ty X370 Gaming X

CPU                         AMD Ryzen 7 1700X

Media HDD             HGST DESKSTAR NAS 4TB    times 2

OS Drive:                500GB Samsung 850 EVO

 

GPU                       GTX 960

TV Tuner               Hauppauge WinTV-quadHD

RAM                      G.Sill Ripjaws V Series 32GB DDR4 2666

Blu-ray Burner       ASUS Blu-ray burner      able to use when ripping 4K discs with MakeMKV
CPU cooler            Cooler Master MasterLiquid 240 AIO

Power Supply         EVGA 650 80+ Gold

Case                       Thermaltake Chaser Seires

 

Thank you for your help.

[Electronics Wizardy]

Why do you want to get a m.2 if you already have a ssd? What do you wan to store on the ssd.

[J_M_O_]

I figured since I am upgrading might as well do it. I was also going to reserve the ssd in case I used the computer to host a game for friends, have done it in the past but not that often.
I have been out of the "tech loop" for a bit. Thought M.2 was nice to have, more of a 1st world problem I know.

[Founders]

9 minutes ago, J_M_O_ said:

I figured since I am upgrading might as well do it. I was also going to reserve the ssd in case I used the computer to host a game for friends, have done it in the past but not that often.
I have been out of the "tech loop" for a bit. Thought M.2 was nice to have, more of a 1st world problem I know.

 

This would be my recommendation for an M.2 NVMe SSD:

 

Sabrent 512GB Rocket NVMe PCIe M.2 2280 Internal SSD High Performance Solid State Drive (SB-ROCKET-512)

[seagate_surfer]

Friend the M.2's are quite reliable, generally speaking the quality they offer in this standard is very good, almost literally you can not choose a bad M.2 that is PCIe NVMe type. Here are some options in case you want to check it out:

Internal and Specialized Solid State Drives (SSD) | Seagate US