This one is pretty family-friendly, too. Who in their right mind would oppose a home theater with surround sound, motorized recliners and a popcorn machine? And yes, your mini-theater is technically a man cave, but that doesn't mean horror flicks and gangster shoot-em-ups have to be the only features on the movie menu. There's no reason you can't have Saturday-morning Disney parties or (gulp) the occasional "Steel Magnolias" screening when your wife needs a ladies' night. And you can still have your bar, of course -- it just might be a smaller, more subtle one.
Must-have: Don't settle for a regular old HDTV when you could have a projection screen.