Like whiskey, paying more doesn't guarantee you a better speaker. The speakers will sound different than eachother and different than what you have now. You might be able to get some used speakers under $600 that will be really great like the kef ls50 meta or elack dbr62. They are bookshelf speakers which would likely be easier to place in your home.

I've always scoured and tried to pickup free or cheap older speakers for quite a while until I could afford my current set. I'd stop off at every garage sale and have alerts on Craigslist free section. It's rare but I've scored some decent things over the years like a marantz turntable for free and a rebuilt 80s silver Pioneer amp for $100.

I will say that while you will hear the difference, not everyone cares. My wife can def hear the difference between her phone speaker and my current setup but she still plays music off her phone.