Thanks for all the responses! I’m very grateful.
I already have an Airport Extreme 802.11AC.
Ok, after much research, I went and bought the best available wifi router on the market:
Netgear Nighthawk X10 R9000 - AD7200 MU-MIMO Tri-Band WiFi Router
I’ll put my Airport Extreme 802.11AC up for sale - let me know if you are interested, I bought it on Oct 11 2013, still have the original receipt from Apple Chadstone store, cost $249 on purchase brand new.