UnRAID - NAS/CCTV Questions (Linux/Win)

Hey all,
First time poster so hopefully I have it in the correct section.
I have been using an intel G3528 as the brain for my current NAS setup. Its connected to 2 sets of mirrored 3TB HGST Deskstar 7200rpm drives as well as a 128GB SSD Boot Disk and 128GB download disk (old and punished SSD). This is running Ubuntu 17.04 with access through samba shares.
I have been setting up a wired Cat6 LAN network in my house as well as beginning to buy a bunch of 4MP POE cameras to use for a CCTV setup with BlueIris. I will have at the minimum 3 CCTV cameras as of next week with an expansion to probably 6-7 in the future (my POE switch has 8 ports :wink: ).
I have read that for a setup such as what I'm looking at I will most likely need to use a better CPU. My gaming system at present has a 4790K and my android build PC has a 5820K. I still run builds, probably not as much as I used to, but was thinking of maybe using my 4790K with UnRAID, splitting 1 core&thread to NAS duties and the other 3cores&threads to CCTV duties.
Will I be leaving myself short with NAS duties if i run this route?
Should I just throw my 5820K in the system instead?
If i setup UnRAID will I have to reformat all of my storage disks again?
I was thinking of picking up another drive and using another spare SSD i have lying around for CCTV cache and somewhat long term storage (Or am i missing something that I wont be able to confirgure?)
Should I pick up an add in NIC for dedicated LAN access to each VM?
Thanks all.

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