The trick for getting it right is to note that you can't increase the amplitude of the file without going over -3dB, and that you have to achieve your goal by altering something about the peak to RMS value. You'll see that for this file (which is a speech file) it's almost where you'd want yours to be. I've highlighted and pointed out the line you need to look at. At this point, you need to look at the Amplitude Statistics, and scan your file. The easy bit, as you've figured out, is getting the peak level correct - you normalize to -3dB. Once you've got your recording, with its nice low noise floor, in the can the rest is pretty straightforward, except that there are several possible ways to get at it. This is all fairly straightforward Audition can manage this easily, but your first requirement isn't actually an Audition issue at all - this is determined by your recording environment, and to get a -60dB noise floor, you're going to have to have to create or use a quiet environment to record in, or you have to resort to a bit of trickery with Noise Reduction, which quite frankly is best avoided.
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