If your speakers are already satisfying dont change them...
Upgrade cost lot of money because when people think about it it is most of the times because they dont know what to do out of desesperation with what they already own....
Learn how to embed your system acoustically in the right manner...But dont buy any costly solutions...It is more fun and you will learn way more creating your own devices....
Try my last experiment... Cost: nothing... Reward: a totally new system....
"Helmholtz-Fibonacci silent organ" A room tuner i devised myself with bricks and plumber pipes in one hour...If you have crafty hands you can make them esthetically beautiful.....
They work with a group of three bricks of three pipes which have a lenght approximating the golden ratio, then changing the way sound waves react to the normal pressure of the room...Helmholtz is the father of room correction and the golden ratio optimize the working of the resonators on all frequencies....You must choose the lenght of 2 sets near one another and the last set must be with more distance in lenght....i located 2 laterally to the speakers at some short distance and the bigger set behin my listening position, you could put it behind your Tv... 😉
Experiment with your room it is fun.....
I sell creativity, not products or market conditioning, or some electronic blathering about new upgrading product.....
Audio is mostly acoustical embeddings not electronic design first, after that it is electrical and mechanical embeddings...It is easy to buy a good electronic design now at low price, audio engineering is mature for the last 60 years....what is less easy is to found the right way to embed these good products....
Anyone with money can buy a good amplifier but how to embed it for his optimal working is not delivered with the instruction manual, sorry.....
Dont upgrade, except if you are in the obligation to do it, embed them well before any move....
My best ...