I am all about security cameras.  I just did a 8 camera system at my home.  I am very happy with it.  I just think if a criminal is planning a crime and he sees CCTV  cameras mounted he will skip my home and go to the next.  Why take a risk when there are so many homes out there that do not even have basic alarm systems.

Here are the cameras I am using..  I thin think they are pretty intimidating too!

DWC-B1363TIR - Digital Watchdog Weather Proof IR Bullet Camera with 540TVL and 3.3-12mm Varifocal Lens - http://www.cablegiant.com/Default.aspx?p_id=4&Product_id=1328

They are screws that you can't take off with a traditional screw driver.  You need a special tool.  It is very common with security camera housings. 

Here is a tool I have to take off security screws....

http://www.platinumtools.com/tools/19016.html