Build the Linkwitz LX521 system and you'll have your "forever loudspeaker." If you can't do the woodworking, then go to a local cabinet maker to have them make it up for you. It's a simple kit. The driver kit, pla ns, and necessary active crossover are about $3000.
The San Francisco Audiophile Society had a listening session with the LX521 last year which was well attended. More than one person in attendance decided right then and there to make the move to the LX521.
Madisound also sells flatpak cabinet kits too, but they're about $1000. You might very well be able to find a local cabinet maker who could knock them out for you at that price.
The thing which will most determine your eventual system price will be your choice of amplification. You could fabricate your own multi-channel amp from Class D modules you get from Parts-Express, or you could source the needed 10 channels in some other way. There are a lot of good "zone" amps on the used market.
Looking for wider soundstage
My system consists of:
parasound a21+ amp for LF
rogue st 100 dark for HF
Aurender n10
schiit Yggy dac
don sachs 2 preamp
legacy signature se speakers
Looking for wider soundstage room is not treated but it’s not bad and I have moved speakers around Thanks for any advice I have believed my amps could be better but not sure thanks in advance