What makes your Home Theater system

I went to see "Hellboy" the other night at the local IMAX theater. I must say this film was quite impressive on a grand scale! Very very very dynamic and powerful indeed. I always like to go see these types of blockbuster action flicks at a good cineplex first, so I can compare to home systems for refernce, at the very least. (I like to remember what it was like on the big system/screen in the back of my mind).
There is a lot about these large theaters and powerful suuround systems that is to be admired. Yet I find that the theater experience is quite diferent from what most of us experience at home on our systems...for better or worse. I'm wondering if anyone here as any input as to what it is about "their system" that they feel makes it special?!
Please be specific about equipment, room, set up, acoustics, whatever. Thanks for input