Here’s a complete system that’s more than adequate for your room and includes everything (except cables) for $2500. IME for HT you need a really good center speaker and subwoofer, and this nails them both along with a great supporting cast including wireless surround speakers so no messing with long cables. This will blow you away, and you’ll have $500 left over for cables although you really don’t need to spend near that much (lemme know if you want recommendations there). Hope this helps, and best of luck.
https://www.svsound.com/products/prime-bookshelf
https://www.svsound.com/products/prime-center
https://www.svsound.com/products/sb-2000
https://audioengine.com/shop/factory-refurbished/a2-wireless-speaker-system-refurbished/
https://www.svsound.com/products/soundpath-tri-band-wireless-audio-adapter
https://www.monoprice.com/product?p_id=31263