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A clunking in the front suspension, can be a couple of things. First I would think that it would be the upper strut bearings. The way to check this is to find a bump on a secluded road and have a friend drive the car very slowly over the bump with the hood open and your hand on the upper strut bearing. If you feel the clunk in your hand then it is most likely either the upper strut bearing or the shock. The next thing to look at is whether the bearing is deforming or the strut is moving and the bearing is not. If the rubber of the bearing is deforming then you have a seized strut. If the strut moves and the bearing does not deform then I would suggest replacing the bearing. The clunking can also be caused by very badly worn ball joints, but I doubt that if you have no shimmy problems.