IMO an IScan will not be good enough for a projector of that caliber, I feel it deserves better. A Quadscan or a HTPC I feel would do a better job. With 480p that the IScan does scan lines will be very noticable inless your screen size is very small and you set very far back. If you go the HTPC route or a scaler you shouldn't need a progressive scan dvd player it will do the deinterlacing for you.
Mike
Mike