XNT 9 SI 180 T
This is also known as compact. The HD model of ducer has longer crystals. Might be worth the upgrade on that screen.
The HDSI transducer would be an improvement with ANY SI model that has the standard Compact SI transducer.
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1