1. Week Calendar - load up fast, and the hours displayed is configurable, making this my goto app for checking my upcoming schedule in the coming week.
2. Todo - people complain that Appigo is charging too much for the sync service, but when I really think about it, for an app that loads up fast, syncs quickly and reliably, and is feature rich, 2 dollars a month I am most definitely willing to pay for.
3. Due - for anything I need to remember to do but isn't important enough to be crowding up my calendar or task app. If I need to remember to start the laundry right when I get home so my clothes are dry on time, well this is where that reminder goes, and this app going off every minute will not let me forget.
4. 1Password Pro, for what others mentioned before.