^^haven't seen Waqar or Wasim? wow how young are you?
As a Test bowler Steyn will definitely be there with the greats once he finishes. He might not be the greatest pace bowler for South Africa since there is Donald as a competitor but personally having seen both Donald and Steyn I would rate them both as equally good.
The only criticism I have of Steyn is his lack of impact in the ODIs. The greats in the above list never got whacked around in any format but Steyn seems to really get hammered when he is not in rhythm.