I used to go to GPS central when they were in their old location and they were REALLY good. However I visited them in the new location and wasn't impressed. The "sales" person I got that day knew les about GPSes than I did. The other guys I had got there were more like techs.
Recently went to GPS city for the first time. Not much to see, really small show room. Super friendly and knowledgeable staff. I was there for quite awhile asking tons of questions. Ended up getting a USB gps reciever for my touch screen laptop. I'm going to try it with Oziexplorer.
Havn't tried Nroute but I heard that it doesn't work well with offroading and topo maps as you cann't zoom in far enough.
Anyone here using it for offroad?