The above poster is correct - The Etrex (yellow), Etrex Camoflauge, and eTrex Summit do NOT have WAAS, but the Garmin "GPS 60," which is also yellow, does have WAAS.
That link you provided really cleared up my confusion! Garmin's web site says the Venture has "a worldwide database of cities," which I took to mean street maps of those cities; but actually it's just the lat-long of each city.
The Legend, on the other hand, has a "built-in basemap of North & South America with cities, major roads, lakes, rivers, railways" and the ability to download 8MB of street maps.