True, power consumption should be considered. I guess doing this would be a good choice if someone has a NAS already running.

you're much better off with something like an ER-X I pretty much recommend a plain jane router which can run DD-WRT for anyone. All this is clearly overkill, and more importantly useless for most people.

Another choice is getting a cheap NUC like x86 device and get AP-only devices for good coverage.