My vote was for the PFF-7's - on the WR Blue Impreza it is almost a classic combination especially in gold. However, if you want to be slightly different get them in anthracite - and yes I am more than slightly bias'd on this matter I know. The basic PFF-7 shape is superb and suits the lines of the MY05 STi, I wouldn't have had any other wheel on mine.
AS PRODRIVE INTENDED.............
Dave