Turns out that digital cameras are quite inexpensive now. I found a pretty good one for less than $100, and I'm mounting it high on the garage facing the driveway with a big sign. I've also put signs warning of recording on all of the entry points.
My co-worker informed me that the police have to suspects in custody, they were caught at the scene of a break-in by a homeowner. They took off when he arrived, he got their plates before they left. They admitted to several local thefts, and told the police that they simply traded what they stole with their dealer.
Nice that they got caught, but they'll be out soon, and there's no shortage of junkies out there- unfortunately.
Thanks for all the advice.