Recommendation for simple project/task time tracking app

I'm looking for a very simple app to allow me to track my time on particular user-defined **projects** or **tasks**. However, my requirement is slightly different to those in questions such as Is there a good time automatic time tracking tool for Mac OS X as I don't need something that will automatically track my time spent in particular applications such as Time Sink or Time Track Pro . Rather, what I want to be able to do in a rough "must have" to "nice to have" order is: - Add user-defined projects/tasks to a list each with its own timer - Manually start and stop project/task timers as I switch projects - Idle timer to stop recording activity if I leave the computer for a period of time - Access the app from the menubar (ability to hide dock icon would be a bonus too) - Create subtasks from the main project/task So, apologies in advance for the following, but in my head the interface might look something like the following, but again I'm **totally open to suggestions**: Project Time --------------------- Project X 0:32 Project Y 4:00 Project Z 1:25 Subtask 1 1:00 Subtask 2 0:25 For example, Harvest looks perfect for what I need, apart from the fact that there's a $12 per month cost. I'm not against paying for an application, but I'd like to avoid ongoing charges if possible.