If you're like many people your going out to the movies less and staying in more. Nothing enhances your movie watching then making the audio in your home theater system pop. You could get a simple HTIB (home theater in a box) but with all the great inexpensive options that are out there you can get a 5.1 receiver (what most folks get) and a set of 5 speakers and a subwoofer to build your own home theater. The difference is worth the extra effort.
Home Theater Speaker Deals
Home Theater Speaker systems with Receivers