Bob,
It just gets back to what 2D sonar frequencies you want to use and/or how wide of a sonar beam you want. You could run the 200/455kHz version at the 455kHz frequency to try and avoid sonar cross-talk with another unit that is using 200kHz 2D sonar or opt for the increased 2D sonar coverage of the 83kHz 2D sonar on the WIDE version DI transducer.
Kountrykool,
I think I missed you when you came by to swap the transducer earlier today. Sorry but I was stuck in a meeting at the time.