Even 1Gbit/s is hard to saturate with non-x86 hardware, unless you pay quite a bit. Some off the shelf SOHO routers that cost hundreds of dollars can do it with hardware offloading and absolutely no special features enabled, but if you're on this forum then I assume you want special features.
Checkout the stickied topic: So you have 500Mbps-1Gbps fiber and need a router READ THIS FIRST
TL;DR: if your budget is less than a few hundred dollars then you either have to live with problems (no SQM, cheap hardware, can't saturate the full 1Gbit, no OpenWRT, etc) or you have to downgrade your expectations.
Consider plugging things into a Gigabit switch. That way you can have as many ethernet connected devices and wireless APs as you want. An 8 port switch will be cheaper than everything else here.
Even one wifi router can support 5 wifi connected devices. Alas it can't do anything near 1Gbit, probably a few dozen Mbit to each client. Duckware's site has lots of good reading about the real-world limits of each wifi standard at different MIMO configs and other details, worthwhile noting when shopping for different models.