I've been looking into getting a gps collar for my shorthair. My sportdog 1825 training collar is on its last leg. Had it for 2 years. Anyways, are the tracking collars worth the money?? Which would you recommend? I'm not looking for the top of the line, but pretty close. Only have one dog right now so a multi dog system isn't neccassary. Also, can the garmin series be used as a regular gps aswell? Thanks for your input.