Any suggestions on my next logical GPU upgrade such as another 980Ti for SLI or if I should replace that with a GTX 1080 or wait for the 1080Ti My current build is as follows; Also any recommendations on replacement peripherals I'm moving in a few months and plan on setting up a small game-streaming and YouTube studio in my new apartment. Thanks in advance for any advice.

• CPU
  Intel Core i7-6700K 4.0GHz Quad-Core Processor Overclocked to 4.5 Ghz
• CPU Cooler
  Corsair H100i 77.0 CFM Liquid CPU Cooler
• Motherboard
  Asus MAXIMUS VIII HERO ATX LGA1151 Motherboard
• Memory
  G.Skill Ripjaws V Series 32GB (2 x 16GB) DDR4-3200 Memory
• Storage
  Samsung 840 EVO 500GB 2.5" Solid State Drive Samsung 850 EVO-Series 500GB 2.5" Solid State Drive Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive
• Video Cards
  Zotac GeForce GTX 980 Ti 6GB AMP! Video Card EVGA GeFor​ce GTX 750​ Ti 2GB Su​perclocked​ Video Car​d (Dedicated PhysX extra display output)
  
• Case
  Cooler Master Cosmos ATX Full Tower Case
• Power Supply
  EVGA 750W 80 Bronze Certified Semi-Modular ATX Power Supply
• Optical Drive HP DVD1265I DVD/CD Writer
• Operating Systems Microsoft Windows 7 Ultimate SP1 OEM 64-bit Microsoft Windows 100 Pro 64-bit
• Head Mounted Display Oculus Rift CV1
• Monitor
  HP LA1905wg 19.0" Monitor
• Surround Monitor 1)AOC G2460PG 24.0" 144Hz Monitor G-Sync 2)AOC G2460PG 24.0" 144Hz Monitor G-Sync 3)AOC G2460PG 24.0" 144Hz Monitor G-Sync
• Keyboard
  Thermaltake POSEIDON Z Wired Gaming Keyboard
• Mouse Mad Catz R.A.T. 7 Wired Laser Mouse
• Headphones
  Logitech G430 7.1 Channel Headset
• Speakers
  Logitech X​-530 5.1 7​0 Watt Sur​round soun​d speakers
• External Storage
  Western Digital Elements 3TB External Hard Drive