Persist data between views

[efraimya]

Hi,
I am developing an app in which the user enter a search word and receives results from a web service (I control the web service). The results are displayed on a uitable view and then the user can select a row and navigate to three - four level of inner details (I am using the uinavigation control).
I am wondering what is the best way to persist the data between the views.
I am currently using the application delegate to store an array of objects which I can access from everywhere in the app. It works fine but I read that it is not a good practice for the job (I am concerned about memory issues) . I tried using Core Data framework for the job but than I realized that I would have to read my web service results, and loop them one by one in order to insert them to database. I also will have to delete old data because the data I am saving is only actual for the current search. I read about p-lists and saving data to file system but could not find a real good solution for my job...
Any help will be appreciated!!! Thanks!!!