AC1750, the first 2 in the list. 58.99
Like this one?
TP-LINK WiFi Router AC1750 Archer C7 Wireless Dual-Band Gigabit, Router-AC1750 https://www.amazon.com/dp/B00BUSDVBQ/ref=cm_sw_r_cp_api_i_wJ8qFbGSHS1SZ
The Zoom 5341j is probably the best modem for the money.
Probably the best router for the money is the TP-LINK Archer C7
I have it over WiFi as well and its completely playable. I do have a fairly decent router though. TP-Link Archer C7. Also my router is upstairs in my loft about 15' away from my Steamlink and there are no walls in the way.
I would bet that a wired connection would be better, but the way I have it set up is completely fine. I've never ran any latency tests, but I would guess its close to Minimum = 0ms, Maximum = 5ms, Average = 1ms
and get TP-Link Archer 7 Router will have 0 issues with wifi.
https://www.amazon.com/TP-LINK-Archer-C7-Wireless-Gigabit/dp/B00BUSDVBQ