At least the winner for me is the Schlage B560 and B660 Series Deadbolts.http://professional.schlage.com/products/pc_hdcp_baux.asp I find the Schlage a good choice the B560 is a Grade 2 commercial lock and the B660 is a perfect choice for a Grade 1 Lock. http://schlagelocks.wordpress.com/2009/02/18/how-are-commercial-locks-graded/ The above link will help you understand what and how the Grading system works.
The reason I choose and recommend the Schlage locks is because the offer the best protection you can get from a moderately priced lock and it offers cylinder interchangeability you can change the standard cylinder to an upgraded Everest, or for Ultimate Security and Key Control the Schlage Everest Primus Cylinders, http://professional.schlage.com/pdfs/literature/Cyls_Keys_and_Key_Control.pdf
You can even change the keyway entirely to a Weiser or other type KIK cylinder.
A couple other nice pieces of the security puzzle are things like steel shielding to prevent Ice Pick attacks and 3″ screws for the receiver side if the lock, these screws not only go into the door frame but are long enough to going into the wall studs and offer excellent protection against “Kick” attacks.
My advice is don’t settle for a Standard home quality lock from your local Big Box store when you can have the Commercial Protection, the Durability, and the Reliability of a Professional Series of locks from your local Locksmithing and Security agent.
Don’t forget that the best lock in the world is no protection if it’s installed poorly.
Check us out at. Mr.ProLock Toronto Locksmithing & Security Systems
Check out Terry in Vancouver at Mr Locksmith