@surreality I like linking abilities/attributes/whatever with similar ideas by alliteration. It's nice for a homebrew system.
I don't know what your attribute ranges are, and I'm probably only even focusing on this because mine go 1-10, but I'd be curious to know how many Ideals you'd be looking at for each character. I think that once you get higher than about 2-4 of them, you're going to have issues with people spreading them out to try and make them cover as many situations as possible (not most players, but most problem players).
I've been coming back to the Principles (Core Principles? I like single-word mechanics names, but Core Principles is more specific), thinking on it further. I think that I would suggest/require that they be in a general form for my own system:
My character will <always/never> <verb> <subject>.
I want them direct, specific, and precise, to leave as little wiggle-room as possible for problem players. Now, obviously, the Principles wouldn't just be those three things, they can have a little embellishment. For instance, I would consider the following to be acceptable Principles:
My character will always defend his family.
My character will never betray her Queen.
My character will never put someone ahead of himself.
My character will always uphold her oaths of office.
My character will never cheat on his significant other (of the moment).
My character will never harm a child.
My character will always get paid for work.
The idea being that you don't want anything too general or broad ("my character will never lie," "my character will always do what's right", or "my character is evil"), and that a format will help people be specific. It will still, of course, require a great deal of Staff oversight, not just at Chargen, but also in-game, to make sure they're not being over-applied. I'm mostly of the opinion that these Principles should be inviolate (barring player choice), simply because of dice--sooner or later the dice are going to make your character break one, and some players really, really, really don't like that.
I do very much like giving bonuses to social combat attacks that align with one of the Principles, however. I think that's a great idea, and will undoubtedly steal it if Principles make it into my system (please consider imitation the sincerest form of flattery).