Hi - just purchased my first ever motorcycle - 2003 Buell XB9S and have basic questions on what is the best lock to use for security...One that clamps onto the just the front disc? or just the rear disc? or on each disc? Or is a 6' chain the best option? With or without an alarm? I have to park my bike outside and I live on the 3rd floor. Thanks for your advice to this "rookie".