I don't understand why you would replace the speaker grills. The factory location (with spacers to provide additional depth) provide more than enough room for any aftermarket speaker, without the need modify the interior of the car at all. (I'm a bit fuzzy as to what installing "new speaker grills" entails.. that alone would scare me away)
That being said, in my experience - the weakest link in a factory audio system is the head unit. Perhaps someone can comment on what gains upgrading the HU has had - keeping the stock speakers, and vice versa. I upgraded both and have been quite happy.
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