YOU CAN BUY A VERY GOOD, beyond decent, A/V receiver these days for $300 to $400, including ONKYO, YAMAHA, SONY and DENON.
THE SPEAKERS are the real heart and soul of any audio system. Basic rule of thumb is 30-35% AVR and 70-65% (in dollars) for the speakers.
Not knowing your actual budget or room set-up makes difficult to suggest any worthy speakers at this time.
Really want to purchase a home theater system. For watching TV and music. Read Consumer Reports, searched forums. Almost purchased Yamaha Receiver for $700 too start, then decided simpler to purchase HTIB. Looked at Yamaha HTIB for $600. Really confused on getting a great HTIB.