Bad bushings and tie-rod ends could cause this... Just jack up the front of the car and have someone wiggle the wheel side to side and up and down. Check all the joints by putting your hand on them and look for play, serious wear could cause a clunk. While you're under there chesk your ABS ring on the driveshaft, look to see if it's damaged... My shop got a Prelude 4WS with the same problem and it turned out to be the ABS ring... Might as well look @ the ABS sensor wires and connectors while your there, couldn't hurt, it might be something simple.