Is the space large enough to warrant enjoying the speakers as they should and not just on volume 10 before neighbors come knocking down your door.
Good quality sound does not have to be obnoxiously loud.
Ile siku utajipata ukitafuta crickets chini ya kiti, hadi umemute sound na ukachukua torch umulike uweze kuitafuta ndipo one gets to appreciate quality man.
There's a myriad of AVRs, sijui which is powerful enough to run which set of speakers
This is why I advise for one to research. Polepole tu bila haraka.
Off the top of my head, some of the more common brands include Denon, Marantz, Onkyo, Sony, Sherwood, Kenwood, Yamaha, Harman Kardon.
Product reviews and audiophile forums are a good place to start.
Is the space large enough
Valid concern. Methinks a typical sitting room (hizi malandlords hutujengea) can easily accomodate a 5.2 or 7.2 speaker set-up.