I am a single guy, about to hit age 30.  I am looking at moving back to my hometown.  i don't make much money, so I can't afford a home that is luxurious, but I don't want a luxury home.  I would prefer a more Cabin-like feel.   I still want high speed internet, and maybe cable TV, but otherwise, I would like to live out in the middle of the woods.  
 
I like movies, and want to have a home theater like room, even if my "living room" is just more like a theater.  How much space do I really need to be able to accommodate a bedroom, small kitchen area, bathroom, and a room that would serve as a media room/home theater/ where I have my mass of electronic radiation room?
 
My Tv isn't huge, 40 in LCD.  I have a surround system, 7.1, but i only have 5.1 set of speakers.  In a smaller size theater setting, I think 5.1 would be more than enough immersion., but adding another pair of small speakers for 7.1 wouldn't hurt my feelings... I like speakers.  But, 7.1 isn't much use if I only have music playing.  
 
So, in all seriousness, how much space is necessary to make a 'cabin' big enough to hold all my wanted rooms?  
As I said, I am looking to move back to my hometown.  I could either keep wasting money on rent, or buy some property.   And, in buying property, I have the option of buying an existing house, or building up a place that is set up to fit my taste.