Have been looking into this myself. Have not made a purchase yet, but research has pointed me in this direction:

https://forum.openwrt.org/viewtopic.php?id=65956

It seems like good old Atheros is the way to go, based on QCA IPQ8064. Which apparently is at the heart of any of these bad boys:

TrendNet TEW-827TRU
Linksys EA8500
Netgear R7500 v2 (the v1 uses a different Quantenna QT3840BC chip)
ASRock G10
Amped Wireless ATHENA AC2600 (RTA2600)
Amped Wireless ATHENA-EX AC2600 (RE2600M)
TP-LINK Archer C2600
TP-LINK TGR1900 (Google OnHub)
ASUS SRT-AC1900 (ASUS OnHub)

Again I have not tried any of these personally yet, but they look like good options.