I will second Cadnliz comments on this topic. Movies especially anything made in the last twenty years are meant to be enjoyed in full surround. If you are seriously considering assembling a home theater system you should seriously consider going the full surround route, as a matter of fact I wouldn't even call it home theater with strictly 2 channel sound, I would call that a movie thru your stereo. The last point I will make is a simple one, if the filmmakers took the time and effort to make the movie and played it at the theaters using multi channel sound tracks, don't you think to get the best representation of that at home you should utilize the same multi channel playback. Wow and that all comes from a tried and true 2 channel guy LOL!!
