humminbird greg- I am wondering if the price difference between the 587ci hd di and the 597ci hd di is worth it. I see that the 587 is 2400 watts and the 597 is 4000 watts peak to peak. Exactly what is peak to peak watts? Does it mean it emmits a stronger signal? Is this really the only difference besides the horizontal pixels? If it where you, which would you get and why. Also bass pro has a $75 dollar mail in gift card to bass pro if you buy the 597ci hd di unit this month making it around $575+tax.