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IMO it might be better to get a blower type cooler card for the top card, and have a fan in front to feed cool air directly to it (i.e. case with mount for fan front of cards, or using Antec Spotcool if the case don't have mount).
For Crossfire, I would recommend getting another HIS IceQ. As for your side-panel case fan as intake, if the position is behind/left of the intake fan of the IceQ cooler's fan intake, then it wouldn't be very effective considering the case's airflow direction (from right to left to top). It would worth considering getting one of these Antec Spot Cool fan and place it right of the IceQ cooler's fan intake to feed it cool air directly:
