It's unlikely a standard line doubler will do much for you as it really does not "double" the lines, it only de-interlaces them. Since you already have progressive scan--it's not going to do anything for you (some doublers do not accept progressive input). The Faroudja native resolution might help the picture quality significantly. It uses a fair amount of post processing along with a scaler (as opposed to a doubler) to improve the picture quality--of course you pay for it--Faroudja is not cheap--but does make great quality pictures.
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