New Mediacom customer need router

There's many factors that influence it. 

you put size but is it all on one floor? is it trilevel? 

what are the interior walls made of (certain materials block wifi signal)

how many devices do you plan on using?

What are you using it for? streaming/gaming/etc

And sadly, budget. Its pointless for us to recommend a $600 router if the budget is $200. 

for single router solutions i usually recommend the R7800

For mesh solutions, usually a triband orbi setup.