There are so many different answers to your questions.
Where to start, the Elite 7Ti is a great unit. You'll love the touch screen, if price is an issue there is a 5" that's around the $900 mark but it doesn't have NMEA 2000. The total scan transducer is a great tool. Has 2D 83/200 kHz and also built in structure scan with 455/800 kHz and also does water temp.
The engine interface cable is a great addition but remember you will also need a NMEA 2000 starter kit to create you NMEA network. You need to make sure your motor has the proper output as well to connect to the NMEA network.
As for the sonic hub 2, it is only supported by the HDS units so you would need to upgrade to rum the music.
If you have any more Lowrance questions feel free to pm or post here.
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