Triple system advice, two WoW MultiBoxing systems, one server.

Hey guys,

Planning 3 new systems, would like to get some advice on my plans so far.

Short background: My wife & I both like to play World of Warcraft, Multiboxing style. She plays up to 5 accounts, I've played both 5 and 10. 5-boxing brings my wife's rig to it's knees (on lowest setting), mine can handle 5-boxing (not perfect, but playable) but 10-boxing, even with CPU overclocking, is just to much to ask, both systems are at least 3 years old. So no upgrading, planning for some new toys (thumb-rule for Multiboxing: at least one tread (one core would be better) per game-session). Third system is a much needed new Server.
Budget: I've just given up having one, got blown and raised at least twice already.
Storage: I'm still waiting for the bigger 2014 Synology NASs to be announced and released (1814+), therefor no hard drives just SSDs.
Monitors: The wife's got 4 (one full-HD, the other 1600x1200) , I've got 6 (center is a 30 inch 2560x1600, it flanked by two 1600x1200 in portrait, above those three more 1600x1200).
Peripherals: Logitech G13, G19 & G600.
Goal: More power!!! & Silence.

Here are the plans so far:
System 1 (Server), I know its overkill:
Asus Maximus VII Impact
Intel Core i7-4790K
Corsair Dominator Platinum 16GB DDR3-2400
Samsung 850 Pro 256 GB
Corsair AX 760i or HX 750i

System 2 (Mine):
Asus ROG Rampage V Extreme
Intel i7 5930K or 5960X
Corsair Dominator Platinum 4 x 8 Gb DDR4-2666 CL15 - or - G.SKill RipJaws 4 x 8 Gb Kit DDR4-2666 CL15
Samsung 850 Pro 256 GB
2 or 3 EVGA GTX 980
Corsair AX1200i

System 1 & 2 will bunk together in a HAF Stacker (915-935-915).

System 3 (Wife):
Asus X99 Deluxe
Intel 5820K or 5930K
Samsung 850 Pro 256 GB
Corsair Vengeance 16 GB DDR4-2800 White
1 or 2 EVGA GTX 980
Corsair AX 760i or HX 750i
Corsair Carbide Air 540 Silver Edition

I know the server is a little overkill, it will probably be doing very little most of the time. I like to have the extra power so I can run some of the game sessions on it when my main system runs out of power while MultiBoxing to many account.
Gona custom water cool both system. Never water cooled before, so we'll see how that works out. Was planning to put an Alphacool NexXxoS UT60 360 & an Alphacool NexXxoS XT45 240 with 5 Corsair SP fans in my Wife's rig. The HAF Stacker, with the two systems in it, has room for 2 360s (60mm) and 2 240s (60 or 80mm) radiators. If there is sufficient room I'll do push-pull on the 240 radiators. I'll be getting EK Waterblocks all round (probably the hydro copper 980s), rigid tubing, Aquacomputer Aquastream XT pumps (will one suffice for the Stacker?) and an Aquacomputer Aquaero 6 to control it all.

My questions:
1 - I heard the HX750i is quieter than the ax760i? Do the Server and my Wife's system need 750 watt or could they do with less, how about my main system? What would you advise?
2 - I would like to get 32GB memory for now and upgrade to 64 later, this means I'm forced to buy 4x8GB, but I can't find any kit with speeds higher then 2666 Mhz. Should I settle with the lower speed memory, or get cheap 8x4GB with higher speeds and wait for the bigger kits to be released with higher speeds and lower prices.
3 - Is there a difference between the 5820 and 5930 when I would at the most use that system for double-SLI.
4 - There's a lot of talk about a 980ti being released soon, should I wait for those or get 980s. Will there be 980s with more VRAM?
5 - Will the cooling capacity I have planned suffice to keep the systems quiet with headroom for some not over the top overclocking of the CPUs and GPUs?
6 - Will one waterpump (Aquacomputer Aquastream XT) suffice for both systems in the HAF Stacker?
7 - Would like to get some lighting in both systems, any ideas?.
8 - Would you change anything.

Any other advice is off course welcome.

Sorry for the long read.

Thanks sPˊ!ˋKe