Here's some more background info:
http://en.wikipedia.org/wiki/Offset_(wheel)
http://www.1010tires.com/WheelOffsetCalculator.asp
To answer your question, 19x8 ET30 could rub a bit based on previous comments that ET32 on an 8" wheel seems to be as aggressive as you can go without rubbing, especially if you're car is NOT lowered. As you lower your car, you will achieve more negative camber which will help tuck the top of the wheel under the wheel well. So if you lower your car, you will improve your chances of having no rubbing issues. The tire brand will also make a difference because all tires have different shoulder design and while you may have issues with one brand, you won't with another. Would I buy these wheels??? Yes.
Also, please do yourself a favor and get an alignment after you install coils. Most people here don't do this for some reason but it makes a very big difference for the ~$100 or so it costs. I went with RS4 specs and -1.3 camber on all four corners, matching the camber in the front, which is not adjustable and is dictated by the height of your car.
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