Hi, I'm completely new here but I've been searching high and low for information regarding purchased Garmin maps. I'm currently debating between buying a TomTom with World maps (TomTom GO 510 World), or a Garmin with European maps preloaded, and then buying an extra set of maps for North America. I like the Garmin GUI, but I want lifetime updates to the maps if I buy an extra set (they're included in the unit I'm considering, 2589LMT). Also, what's the difference between buying "regular" Garmin maps and the nuMaps?