What should be able to "Intelligent Home"

Today, while working, I had a question that I really wanted to ask Habrapho users.
Recently, often wondered about the "Intelligent Homes":

What should he be able to?
How to implement it?
How much would you be willing to pay for all this?
Do people need it?

Today I would like to know what people think about all issues except implementation.
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1. I believe that there must necessarily be the ability to control the light, set the time of ignition / redemption. Also, the temperature should work as a climate control in cars. Windows should also, like light, open and close at a given time. On the last, the pictures of the incoming should be taken either with a key that is not known in the system or without a key (hacking) and immediately sent to the specified mail.

3. I don’t even know how much I would give. At this time I am learning and I don’t have money for these pranks.

4. I hope to find out the answer here.