Have you estimated the cost of seating, lighting, the control system and installation?
What is your budget? Expect to spend about the same amount on the audio as you do on the visual. In other words, if you spend $1,500 on a projection system, expect to pay $1,500 on surround-sound speakers, including the receiver and amplifiers.
Have you considered a home theater-in-a-box? These all-in-one systems take the guesswork out of choosing individual electronic components and typically include speakers, a receiver, a DVD/CD player, possibly a VCR or DVD recorder, and cables and a remote control. Systems are priced between about $300 and $2,000.