Mine's good for me, but far from good I'm sure if you're asking an all-out audiophile.
JBL 3.5"s in the dash (wanted Infinitis to match the rest, but that was all I could find)
Infiniti Reference 6.5"s in the doors (you can aim the tweeters on these, which helps fine tune things)
Infiniti Reference 6x9"s in the rear
some sort of Kenwood amp (it's been a while)
and a 12" Rockford Fosgate sub in the trunk. An 8" would probably be perfect but the enclosure is as much for show as it is for performance, so a small sub wouldn't cut it. I just tone down the levels on it and it works out nicely. Plus since it's a convertible, when the top is down I can raise the levels up again and easily make up for the lack of an enclosed vehicle.