i have bought a boat and the electronics are really out dated. looking to upgrade but i have been reading online about different ones and cant make a decision. I do alot of bass fishing and would like something to where i can see detailed structure under water and see ledges and drop offs and a unit that has GPS as well. just looking to get peoples opinion on what would be the best bang for the buck. doesnt matter brand humminbird or lowrance. model name or number would be awesome too. thanks for all the help