^^ this. When I bought my 08.5 I looked at both and it was a not a question that the GT Trim was the way to go. The HID's, Rainsense wipers (which I've had before) and the interior trim were worth it.
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The Alacantara trim in the interior came standard with every ms3 from 08.5-09 not just specific for the gt model. But the other stuff is gt specific.