there are many entry level gps/sonar combos on the market
do a search and see what turns your head asking questions like that will just turn into a this versus that thing
if you like lowrance then go with that if you like hummingbird then order that one
garmin also makes combo units
i have never used a hummingbird so i cant say anything about them
i have a lowrance 27c and hds7 both are big screens so not cheap
but they have served me well over the years
as a side note if you limit yourself to bass pro shops or cabelas then you are gonna over pay for the unit whichever one you choose