I'd like to mention that the cat5e cable present in your walls is rated to 2.5Gbps, and would often still work at 5 or 10Gbps over shorter runs in a home. 2.5gb equipment is very cheap nowadays. I got a couple of no-name switches under $40 each and they all work perfectly. Wired networks will always have better consistency and latency characteristics, too, if that matters to you.

It used to matter to me a few years ago but somehow I just no longer care enough.