re: What router should I buy?

My mind's kind of fried from the day, but yeah, I think I can get something written in the next few weeks or so (which is what I said about the PC guide, but it ended up being a several-month endeavor and 10 times longer than I intended).

What are some of the basic topics I should cover?

2.4ghz/5ghz and the pros, cons, and capabilities of each
IEEE 802.11 standards
MIMO/Spatial streaming
Client adapter specs explained
Basic features other than wifi (10/100/1000 ports, USB ports)
Selection guide based on general criteria (network usage, type/number of clients, size of house)

What else?

I don't want to get into the weeds on it though. Mainly just want something to offer as an alternative to the mindless "get an AC router" comments.