My GOALS list contains only single entries for each Area of Focus. In your terms:
Home - Buy a new house
If it requires a project plan to be stored somewhere then I would create a project:
A new house bought
This project would contain the project plan and any thoughts related to it in the Notes section (I use Pocket Informant on my IPHone). Then I would add a next action out of the project plan to my action list:
@Errands - Buy a local paper to check for available houses
The link between the goal and project level is checked during GOALs list review (usually once a month or so). And the link between project and NA is checked weekly during Weekly review process.
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