AVS Special Member
Join Date: Dec 2007
Location: Southern California
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You need an HT receiver and 5 speakers plus a subwoofer. The receiver will process the sound, amplify it and drive the speakers, and send the video to the projector, probably via an HDMI connection.
The Denon 1612 will be a good receiver for you, and it is remarkably inexpensive at only $250 or so. I would start by getting it.
The next step is a set of speakers. That will require a budget of somewhere between $500, for some pretty basic speakers, to $1500-2000 for some speakers that will actually sound pretty decent.
For $100 you can get a pair of Behringer MS16 powered speakers from Amazon that will connect to your projector and give you some basic 2-channel sound; they have built-in amplifiers and will connect to your projector. This is about 100 miles away from a decent surround-sound system, but it will get some sound in the room for start-up.