You don't go for the cheap bits do you?!!!
The airbag (3 or 4-spoke it matters not really) is about £400-500 from a dealer and the power steering pump and controller and reservoir (they're all combined into one) is not far short of £800.
These are rough figures, but at the best estimate, don't expect any change from £1000!
Sorry to be the bearer of bad news,
Mike