I am in the market for a new fishfinder with DV and chirp. I will be replacing a furuno fcv667 with a thru hull transducer on a 28 BHM. I have a chartplotter/fishfinder combo so I don't really need a combo but have heard the stand alone fishfinders are not as good as the combos. I don't know if there is any truth to that or not. I like the image in DV mode on the raymarine dragonfly 7 pro as well as the Garmin echomap 74dv and have also looked at the Garmin striker 7dv both of the garmins need the GT-23th transducer I have been told for the chirp function. I don't know which transducer the dragonfly requires for the chirp. I am looking to spend 1000.00 for the set up. Any suggestions guidance or input would be greatly appreciated. Thanks