Cameras and all that are great, but a picture alone doesn't do much unless you can
ID the perp or catch em' in the act. Here's another idea, go to Harbor Freight, or Radioshack, or anywhere else....get you one of those "driveway alert" systems that cause a wireless module to BEEP when the motion sensor activates.
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=93068
They are wireless and you can place the chime module next to your bed. You know thieves go for the saddlebags, so place it in there pointing up. Acquire the proper equipment and go defend your property.
In a closely related local scenario I am familiar with, an armed property owner confronted a thief in the act. The vehicle he was in contained a large sharp screwdriver, the owner knew this. The owner testified before Grand Jury that he felt threatened because the perp had access to the deadly sharp instrument, it was dark, so he used his firearm. It was argued that because the thief already demonstrated his willingness to commit a felony, and he had reasonable opportunity and access to a weapon, there were no formal charges filed against the property owner.
Or, you could just buy a civilian taser and hold em' till Police arrive....your choice.
www.taser.com
....keep large zip ties next to your taser for quick "handcuffs".