The Qualcomm CPU/WiFi chipset based Netgear R7800 has the best 5Ghz range/performance of any consumer router I have tested (am a beta tester) and a pretty good 2.4Ghz performance as well. Better than any on that list to be honest. If you want in depth reviews look at small netbuilder and CNET has some simpler reviews too but the R7800 in pretty much most sites, tops other routers in 5GHz performance and range. VPN performance is also better than the Linksys units as it has more powerful/newer gen CPU. Also its the only one with a properly working MU-MIMO implementation. The R7800 actually is more powerful CPU and WiFi chipset wise than the R8500, only advantage the R8500 has is the extra 5Ghz band which I don't think will help you that much and will definitely not increase range by any means. The Synology RT2600AC also uses the same hardware as the R7800 and is also a good alternative.
Broadcom based routers from Netgear/Linksys (Marvell based units as well)/Asus can cause performance degradation with MU enabled, as Broadcom's implementation sucks. The Asus 86U is also close to the R7800 WiFi wise but its Broadcom based, though using an improved WIFi chip compared to older Broadcom units. FYI compared to the 88U (similar to R8500) the 86U is actually more powerful and using newer gen hardware, only reason the 88U is higher priced is due to extra lan ports.