john smith wrote:

Forget the 430, get a 480.
The 480 is WAAS certified out of the box.
Garmin has been promising WAAS for the 430 since they started selling
them.

Garmin will, in time, provide the WAAS upgrade for the 400/500 series.
The upgrade will also provide additional computational horsepower for
stuff like radius-to-fix (RF) legs.