Not much. Buy used. Buying new stereo equipment is an activity of the wealthy. Everywhere I've ever lived, CraigsList is overrun with excellent used speakers and receivers at reasonable prices.
I won't inundate you with brand-flexing, but I'll say I'm very happy with my home theater system. 4K OLED TV, big ol' tower speakers, and a pretty nice home theater unit. All from reputable brands. All used. Under $400 all together. No shitware.