[stomachmonkey]

Ethernet and access point is the way to go.

Simplest and most reliable / robust.

Something that people forget about unwired repeaters, they can only extend the signal strength they receive.

Draw an imaginary circle around the main wifi.

Center represents the strongest signal and the edge represents the weakest / no signal.

Now draw a circle around the repeater.

How far that circle penetrates the 1st signal represents the best / strongest signal the repeater will give you.

If you go that route you should only use a dual band.

A repeater needs to run on the same channel as the primary wifi. It also has to deal with backhaul over wifi (backhaul over ethernet is preferred) and both radios are also broadcasting to clients over the same channel.

That creates a **** ton of interference and degrades performance.

With dual channel you can extend on one frequency and serve clients on the other eliminating some of the noise.

EDIT: If buying new hardware buy dual channel AC units even if you run ethernet. That will allow you to limit slower wifi devices to one frequency reserving the other for your faster stuff. Remember, wifi operates at the speed of the slowest connected device.