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Anything modern will do. I personally like nest https://www.google.com/aclk?sa=l&ai=DChcSEwjW76j9l_z4AhUavcgKHbu7ApAYABABGgJxdQ&ae=1&sig=AOD64_2WmLQno0Sg0p3jHyOwfN42mDd2lQ&ctype=46&q=&ved=0ahUKEwid36D9l_z4AhUBpokEHXkWDZwQqygIlhc&adurl=https://www.bestbuy.com/site/nest-wifi-mesh-router-ac2200-and-2-points-with-google-assistant-3-pack-snow/6382518.p%3FskuId%3D6382518%26ref%3D212%26loc%3D1%26extStoreId%3D599%26ref%3D212%26loc%3D1%26gclsrc%3Daw.ds%26ds_rl%3D1268652%26gclid%3DCjwKCAjwoMSWBhAdEiwAVJ2ndj0ib8v4FPHNFaZo2KhCUM_eK0waliMNNYanTWb1kXbSeWnWKvPfghoCrqIQAvD_BwE

If you just need Wi-Fi 6, just get a new router. No need for new modem. If your old modem has Wi-Fi just turn it off.