Those are the 3 best IMO. You need to decide for yourself what you want though.
APR - rich throaty sound under hard throttle, very sedate and stealth under mild accel and normal driving, has a completely open system with no restrictions for airflow to pass through.
Milltek - Deep rumble, sounds the most like a V8, very nice under hard accel, can sometimes drone or be too loud in a very few situations
AWE - Between APR and Milltek, not as deep a rumble, not as much throaty and rasp.
NW Exhaust shootout post with videos:
http://www.audizine.com/forum/showth...aust-Fest-2010 (no AWE present at this one)
APR without the SC whine to distract as well as some in cabin video to illustrate normal driving:
http://www.audizine.com/forum/showth...-exhaust-redux
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