Review your selections and rate them in Webform within Drupal 7
Preview functionality is now part of the 7.x-4.x branch. There is an involved discussion about it here: Summary/review/preview page before final submission in multistep forms.

As for prioritizing, I think you would want to add a rating field for each field, and theme the form and the preview such that the initial form would not show the rating field, and the preview would. 

Depending on what you want to do with those ratings, you may want to use a module like Star Rating (which is a simple module that doesn't have any other dependencies) or FiveStar (which is more complex and has more functionality).