If you can afford it, I would recommend one of the newer Digital Storage Oscilloscopes. The have an FFT function that is very useful when you want to look at the frequency domain. They also have the USB port you want.
Re the PC based Oscilloscopes vs stand alone units - if you check ebay there are some used DSO's selling in the range of $250 to $500 which is about what a pc based product would cost, and the specs appear to be better on the stand alone units (especially sampling rate). I mentioned this if want a good general purpose scope - if you are just looking for azimuth measurements, a scope may not be the best approach.
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