I had an eagle in my other boat and it was great. I had better pixel count than the lowrance for less money.
Don't quote me on this, but you may want to do a little searching about their abilty to handle the weather. Mine was inside a pilot house so it never got wet. I thought I remember something about the lowrance units being a little bit better if they were consistantly exposed to the elements.
i have a sea charter 480 DF EAGLE that i had on my boat last year, it also has GPS, if you would be interested in it let me know, i would let it go pretty reasonably. I didnt have any issues with it, just upgraded to color.