I have a much smaller home than you (about 2000 sqft over two stories) and recently upgraded, went with ubiquiti. The thing that pushed me that way is that it’s pretty turn key. I can configure the hell out of it and do all the fancy stuff I want, but I can also set specific rules for different kinds of traffic, including blocking certain sites and countries. Some other routers you can do the same and that’s fine, but I wanted some customization, but also something simple that the wife can muck with if necessary. The other reason was that adding cameras in the future is as simple as adding a wire, it all runs through the same console. And, of course, that I own the footage and that it’s not on some other company’s servers, they won’t give it to cops without my permission… all that good stuff.
If you do decide to go that route, everyone pushes for the ceiling mounted APs, but don’t sleep on the U6 In-Wall units. They look nice, are built well, and have the bonus of a built in four port switch with the first port being PoE if you need it.
If you get bored, you can create a free account on their site and upload your floor plan to place APs and see what will work. It’s not too hard to just try out and see what sort of cost you’d be looking at.
They make a ton of wireless chipsets. Could be a bluetooth speaker, could be a computer.