do not get cheap. cheap motherboards are cheap because they use cheap components. cheap voltage regulator module design with cheap onboard MOSFETs.
cheap motherboards will limit your CPU's response to PBO and stability of your applied DOCP/XMP
mini itx is a choice, though I would recommend against it.
less expansion slots.
agreed here. do not buy for the word "gaming" in the name
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Here's a list of S Tier (the best) motherboards that I would buy right now:
Asus ROG STRIX B550-E GAMING
ASRock B550 Taichi Razer Edition
ASRock B550 Taichi
Gigabyte B550 AORUS MASTER (personal recommendation)(literally the best of the best)
Gigabyte B550 AORUS PRO AX
MSI MEG B550 UNIFY
MSI MAG X570S TOMAHAWK MAX WIFI
MSI MAG X570 TOMAHAWK WIFI
MSI MPG B550I GAMING EDGE MAX WIFI
MSI MPG B550I GAMING EDGE WIFI Mini
MSI MPG B550 GAMING EDGE WIFI
MSI MPG B550 GAMING CARBON WIFI
These boards have the absolute cleanest power delivery of current generation motherboards and are reasonably priced at the moment.
Also all of the above listed happen to have inbuilt wifi-6
If you don't want my recommended one, just pick the cheapest one or whichever one you like the look of the best on that list. You can't go wrong.
Asus TUF GAMING X570-PLUS (WI-FI) is not on the list because it has inferior power delivery compared to those listed above