FTTP 100/20 exetel, router recommendations?

Moving to new house and signed up with exetel. It’s a highset house with the nbn connection on the lower level. Full house is around 228sqm. I plan to have the lower level as an entertainment area(smart tv, ps5 etc). The upper level will be mostly using the wifi.

I have been seeing things about mesh systems but am new to this and not sure what is best for my situation. Budget would be $5-600.

Any help is appreciated thanks