I'd spend the extra 25% and get a side imaging unit. 2D and down imaging are like looking at the bottom of the lake thru a microscope (generally 1/3 of depth so in 30ft of water ur only seeing a 10ft circle of the bottom. side imaging is like looking at a 180 degree panoramic view of the whole lake universe (ruff calculations that's 30ft deep by 200ft each direction=600ft of insane underwater vision).
it's the best extra $150 you'll ever spend in fishing. skip buying ur next 4 rods, 3 reels, hundreds of lures. you won't need them b/c you'll be right on top of the fish with the side imaging.
direct from HB $550
Humminbird | 598ci HD SI Combo