MrHarris -
I think we know that Dinan makes a quality product. Seems like everyone wants to beat that in heads around here lately. I have no doubt it is a quality exhaust with a good sound, no drone, and it adds a little power. I couldn't get past the fake tip; if you can I don't think you can go wrong with Dinan.
If you can wait, I will give you my honest review of the Gintani Sport once I get it installed. Doesn't seem like Lemans has anything bad to say about it so I consider that a plus. If it had an obvious flaw I think he or someone else would have pointed that out by now since I have asked twice in two different threads.
AA is fine too in my book. I just think it is a little pricey for what you get but you really can't go wrong with it either. I had an AA exhaust on my E36 M3 and it was great.