I was also a little confused and bought the cheapest router on the list, the Asus RT-N12. The underpowered 2.4GHz radio meant it was completely overwhelmed by competing signals.

I now run this on an RT-AC68U, which has a dual radio. Is it the most recent router? Probably not, but it gets the job done and has a USB port for printer sharing (no clue if that works, we shall see.)