Mesh advice please

[Moonsafari]

I would like some advice on buying a new Mesh system. I'll list what my set-up currently looks like and also some features I would like to improve on with the new Mesh.
Hopefully you can help:

Current set-up
New build 2-storey 4-bed house so no old thick brick walls etc
300Mb BT FTTP
BT Smart Hub 2 (WiFi disabled)
Tenda Nova MW6 Mesh in Bridge mode (1 x main AP + 2 x nodes). Connected direct to the BT-SH2. Nodes are WiFi connected, no ethernet around the house.
2 x gaming PC's (each wired direct to a Node)
SkyQ (wired direct to the main AP Node)
1 x XBox
Streaming (Netflix, Amazon Prime)
Up to 15 x peripherals (phones, TV's, printer - usual stuff)
The Tenda Nova has been ok but is very limited in both features and real-world application.

What I would like in the new Mesh
RELIABILITY
Min 1 x main AP + 2 x nodes (room for node expansion is preferred)
Better WiFi range than the Tenda
Min 2 x ethernet points in the nodes
Good UI (App or web is ok)
Ability to select which node is preferred for each device (is this possible?)
Ability to select what band is preferred for each device (is this possible?)
Ability to backhaul over WiFi would be a bonus
£600 is ideally my budget but a reliable system is key