Big C it depends on what your budget is. The Humminbird 596 Ci DI is a pretty good unit with GPS, DI and 2d for around 400. The hummingbirds will give you all 3. The Lowrance units give you GPS with either DI or 2d but not both until you get to the Elite7 then your talking 600+. if you are ok with monochrome that unit Handi posted is a real nice unit for the money. Figure out what you want and then call Brian at BBG marine, a sponsor on here for your best deal on new.
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Charlie Weaver USN/ENC 1965-1979