Help Needed With Choosing Gps/fishfinder Combo

I am having trouble deciding on a combo that shows good rock and ledge formation and waypoint marking and navigating. my short list is between humminbird's Helix 5 chirp DI gps g2, Helix 5 chirp gps g2 and garmin's Striker 5cv, Echomap chirp 53cv and echomap chirp 53dv. is there a stand out amongst these, what have others decided on and why or decided against and why. do you have any of these and are happy or wish you chose differently. sorry for so many questions but the more I research the more I seem to be more confused/unable to decide.
I mainly bottom bounce over reef and structure in 30'-70', set lobster pots in 8' - 20' near reef/rock ledges and holes and fish weed banks and am not a tech whiz so looking for easy to use.

what is different/better/worse between echomap 72sv, 73sv and 75sv?

 

thank you for your response, it is helpful.