2006 Honda Odyssey steering problems

Purchased vehicle 5/23/06. Vehicle has vibration in steering wheel since purchase. Honda has balanced wheels twice without solving problem. I took vehicle to dealer 7/13/06 and asked for repair of defect under new car warranty. Dealer refused and gave me a work order stating: honda representative had found, last time in, " vibration to be normal at this time as per dpsm 999"...in conversation with honda rep. He told me vibrations are not a defect but a characteristic of this vehicle.

Vehicle steering is stiff on slow turns and parking. Steering column vibrates at a high rate of speed. Tie rods have been replaced. New tires, rotors and brake pads have also been replaced. High pitched sound also comes from steering column while idling in stationary position. Moisture appears around o-ring leading into the steering fluid pump. Regular maintenance has already been performed since purchase (new in april 2006). The steering issue concerns me as the 'symptoms' come and go.