Getting back into scanning after being out of it for about 7 years. Back then I always had the latest Uniden scanner so I am looking at the SDS100. I need a refresher course on a few things. I live in the Toledo, Ohio (Lucas County) area and I am wondering if I need to add the DMR, NXDN, or Provoice upgrades? I really know little about them. If I need them what would they be used for? Also any other must have accessories? Thanks