GPS Tracker

Looking to get a gps tracker for my valiant. Does anyone have any recommendations. I am looking for something that has a really long lasting battery or needs wired up and has a back up battery. So far the best I have cam up with is the Trackmate GPS Bolt. I am not to worried about the car when it is in my possession or in my garage. But, I am taking it in a few weeks to get the trans pulled and rebuilt. I am not saying I don't trust the place I am taking it, but for some reason if it is outside the shop that is when I would worry. Plus it would be nice to have one as a just in case of theft.