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Denso starter if the customer is willing to pay for what they get. I installed one a while back and it is a great starter. I used longer mounting bolts (40mm) when installing the starter in order to maintain a secure fit since the Denso has a much larger mounting surface.
As you may see in the thread linked above, Mitsubishi also offers a nice starter. My application was best suited for a Denso, but perhaps your customer does not fit the same application.