Looking to upgrade from my Asus RT-N66U

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I've had an Asus RT-N66U for about 3 years now and it has been fine. I have been looking to upgrade to a wireless AC router in the future, but recently the power button has malfunctioned so I have to use tape and some pennies to keep the router on. Money is no object (I am looking for a consumer router). Here is my current setup:

• 1400 square foot home
• Router is placed in the living room, on the same wall as master bedroom
• Wired devices (in living room)
  • Home Theater PC filled to the brim with MKV format Blu-Ray rips (yes I own the physical copies)
  • Playstation 4
• Wireless devices
  • Nintendo Wii U (in living room)
  • Desktop computer in MBR (currently on a powerline adapter, but only getting 16 MBPS via speedtest.net, running the same test on my Note 3 gives me about 90MBPS while sitting in front of the desktop. I will get a wireless AC usb adapter (recommendations appreciated(, as I think this will give my better performance)
  • Amazon Fire TV (MBR)
  • Playstation 4 (MBR)
  • Desktop in 2nd bedroom located on other side of home, opposite of MBR (connected to wireless N ethernet bridge)
  • 1 Dell XPS 13 laptop, 3 android smartphones (travel all around the house)
• Usage and concerns
  • Most common use for WiFi is wirelessly streaming content from HTPC in living room to Amazon Fire TV, and Desktop in 2nd bedroom (using Kodi/XBMC over SMB). As well as accessing Amazon Instant Video content directly through the Fire TV.
  • Online gaming mainly through Playstation 4 and PC in MBR.
  • I commonly pass large files over my network via SMB between all devices. (Smartphone to PC, PC to HTPC, HTPC to laptop, etc)
  • Not sure if important, but I subscribe to CrashPlan it is it always running on the HTPC. Through constant Blu-Ray rips and large amounts of photos from my wife's camera, there is data flowing through this wired PC nonstop 24/7.

 

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I tried editing the post, but it wouldn't let me submit it, so here it is:

EDIT: I forgot to mention that there is also an Amazon Echo in the living room, a Dropcam Pro in the 3rd bedroom that it right next to the 2nd bedroom, and a PS Vita.

From the research I have done so far, I am not sure if a AC1900 router would work best for me with it's higher throughput speeds, or if I would benefit more from a AC3200 with less interference. I have been looking at the Netgear R7000 Nighthawk or Asus RT-AC68U for AC1900. For AC3200, I have my eye set on the D-Link DIR 890L or the Netgear R8000 Nighthawk. I am not dead set on either option, and I am open to other suggestions.