for the gps, I would go with a lowrance H2O, with the marine chip, 100 dollars for the unit, another 95 for the chip, very user friendly, easy to read, with a decent size screen ....
but for the bottom/fishfinder... you do get what you paid for! I highly recommend the garmin 300C or the eagle fisheasy 320C ( both colored ) it can determine hard or soft bottom, vegetation, rocks, boulders,etc.,I fish mostly structure salt or freshwater, and it really helps out having a better FF, it makes a WHOLE LOT OF DIFFERENCE especially fishing around unknown waters! both FF are so sesnsitve to the point that you can see your lure and line going through the water!
Ray
BTW ....both of the units sell for just over 200 dollars