With the upcoming demise of critical API's that have supported Entourage for years, I have been looking far and wide for a solution to calendar and reminder functions that enables me to control snoozing. I like to set a date for, say, a quarterly tax payment and then get an advance reminder which I can then "snooze" on--getting prodded on it from time to time--until it is actually due.
It appears to me that SnoozeMaster, integrating with Apple's own Calendar and Reminders apps will fit the bill. Not perfect but better than any other combination I can find. So far the app has been stable and because its function is inherently simple it is very easy to use. Just make sure that the Notifications are set to "None" for Calendars and Reminders or things will get confusing.