There is significant difference in recreation grade and mapping grade GPS units.
You can get in a recreation grade unit for 150-300 that will suit your needs...bottom end of the other is probably around 2k.
If you're looking for a map grade(sub meter or sub foot) data collection unit, it's a completely different animal and price range.
That said, you can collect waypoint coordinates, bring it into the software and export to a gis format, or possibly an excel spreadsheet and create your points and lines within GIS.
If you're looking to import aerials, remember the files are large, so you'll have to make sure the unit you are looking at has the HD and Ram to deal with it.