The best is subjective. People like different sound profiles. "The best" is easily 5-6 figures.
Do You have a home stereo place or even a best buy magnolia near you? Go listen.
Are you looking for floor standing or what?
Here is a review site. Filter for price and go from there.
https://www.whathifi.com/products/hi-fi/hi-fi-speakers
For 5.1 set ups
https://www.whathifi.com/search/products/5.1?oq=5.1&src=textfield&aq=5.1&type=product&pos=top
Best Buy Magnolia is premium stuff but you ain't walking out of there with a 5.1 system under 3 grand.
I got my SVS subwoofer and Bowers & Wilkins center channel there, 2 premium brands, but that was where I drew the line. The rest of my surrounds are pioneer so I could avoid going over 5 grand. Lol
That said, for my parents' setup I went with HSU Research for all 9 speakers.
I did a shit load of reasearch and HSU is straight up the most respected speaker company that you have never heard of.
One of the reasons why is that they list the full measurements to the public and the audio engineers that reviewed them all confirm their accuracy. A lot of mainstream companies don't do that.
BOTTOM LINE... If I were to do it all over again, I would go all in with HSU speakers. Probably the Hybrid 2 series. I admit, I haven't actually hooked them up in parents basement yet, we still have to put up the drywall and do the floors, but from all the positive reviews on AVS forums I'm confident it's gonna crank the fuck out.
I mean the subwoofer is massive compared to my SVS. Lol
http://www.hsuresearch.com/packages.html
Check out their packaged deals, of you want to go the the theater route. Start all the way at the bottom with the Hybrid 1. That what I got for my peeps.
BTW, the Hybrid series speakers are horn based, but don't let it fool you. It's maximum bang for your buck.