If you get your GIS data into PostGis, then you should try QGis, to visualize it. It helped also fix some bug and find some unexpected stuff, for example - that in postgis (and gis databases in general?) the order of coordinates is different from what you expect from using a gps in everyday life.
Now.. which order was the correct one? I have forgotten after not doing gis stuff for some years now.
The coordinate order is (X, Y) just like in math (and XYZ if you want to use a vertical coordinate) which differs from our colloquial (latitude, longitude). This is easier to remember if you remember PostGIS supports many non-lat/lon non-WGS84 coordinate systems.
Now.. which order was the correct one? I have forgotten after not doing gis stuff for some years now.