Good news is I am home! My sister signed for all my stuff, placed it in my games room --(bad news!) turns out the neighbours had some kids over and a cricket ball went through my window. little stinkers didn't tell the adults, we've had some pretty heavy rain- games room was flooded, all my goods busted, carpets yadda yadda. Insurance takes a while, i'm giving it 3 months zzz.

I'm going to play 15 characters again. Revised specs below (advice from you guys has been taken on-board!)

Motherboard: Need help ** see below.
Processor: Intel Core i7-5930K Haswell-E 3.5GHz 15MB Retail Box - NO FAN (or should I get the 8 core CPU?)
System Storage: Kingston HyperX Predator PCIe 240GB Gen2 x4 (M.2)
Mass Storage: Samsung 850 EVO Series 2.5" 7mm 1TB SSD
Memory: Crucial Ballistix Sport 32GB Kit (4x8GB) DDR4 CL16 2400MHz
Graphics: Palit GeForce GTX980Ti Super JetStream 6GB GDDR5 x2 (I'm leaning towards 3, can't decide)
Power Supply: eVGA SuperNOVA G2 1000W 80PLUS Gold Power Supply
Monitor: https://www.ple.com.au/ViewItem.aspx?InventoryItemId=619889 x3 (Gsync since i'm using nvidia now)

Nothing has been ordered yet, I will be doing it in a few days.
Since I have resubbed 15 accounts, I'm wondering if it would be better to go ahead and replace the 6-core with the 8 core intel cpu - thoughts?
I'm leaning towards 3 GPUs, only because it sounds fun and maybe later on with windows 10 it might scale better then it does now.
Motherboard.. yikes.. I have no damn clue now. Do they need to be watercooled for higher overclocks still? D;
Any recommendations on a MB that can take 3 gpus, 8 core cpu, m.2 SSD and a soundcard..while being decent with overclocking?
Do I need a dedicated NIC for when I max out my cpu (15 box, streaming etc) to offload some of the work? e.g Killer NIC

I'm asking here because those that replied seemed pretty knowledgeable on the subject haha

Thank you!