I think that there is little danger to your hardware in using any overclocking settings such as Ideal. If it doesn't work, just use something less restrictive.

In the long run, maybe you will run into trouble after five years as opposed to seven if you don't overclock. But I doubt even that.

You might remind people who get hysterical about overclocking that their N900s are overclocked already. The question is, can you overclock them more, and the answer is that you usually can.

The same thing goes for power settings like Ideal.