I have yet to find a utility that can function as a true one stop shop for me, but here are three programs that I never leave home without, any one of which may come close to your needs.
- Great day to day maintenance utility
- Lots of basic to moderate options
- Dead simple automation and scheduling for routinely performed tasks
- Many similar functions to Cocktail but with more in depth system monitoring and trouble shooting options
- Expanded Disk Utility options compared to Cocktail
- Great for diagnosing problems you didn't even know you had
Disk Warrior "http://www.alsoft.com/diskwarrior/index.html"
- The "Delta Force" of disk utility apps
- Your First, Last, and Best line of defense for any disk related problem
- Complete re-construction of failed and lost directories and partitions.
Also, for what it's worth, I too find Onyx to be a great program as well, it's just never found it's way into my permanent arsenal. Hope this gives you a leaping off point.