First of all thank you very much for your answer!
The triangle I draw don't respect the real field of view of the camera but only the direction / path were I am planning to dirige it
My best expectation would be , like you said, be able to ID their face well enough to prosecute them in a court-of-law but for budget reasons ,ill be happy even if I'll obtain only a deterrent effect and a generic surveillance of my house from a remote location ( holiday works ecc ) especially in case of ( rare) an alarm trigger.
My plan would be to put LAN cables in the right place and use fa cheap chinese camera for now
I could always change it with a better one in the future.
I had to change regarding the anolog camera idea cos' I don't have enough space in the existin corrugate to put lan cable while I have LAN cable almost there. And I can't use analog camera using lan cables 'cos I am using the lan as my personal computers network.
Meanwhile I am making an experiment , I bought a cheap 720p chinese camera for 140$ and I ll make some experiments with it:-)
I'll keep you posted
I understand that my approach is totally insane and unprofessional and to be hones I a little embarrassed to post in a such pro forum , but unfortunatly I spent almost all my money in building the house
P.S just to meak you laugh this is the camera I boughthttp://www.wi8.com/productn.asp?ArticleID=1634