Since Garmin has announced the Livescope Panoptix. The prices on the first generation used Panoptix transducers are falling to about a 1/3 of their original prices. These include the PS 30 , PS 31 , PS 21 and PS 22.
Just seen a PS 30 sell for 450.00 Lots of owners wanting to upgrade to the livescope. If you are not familiar with Panoptix. Study the online videos on ice fishing using it.
Any of the above named Panoptix transducers will make finding fish easier. The PS 22 would be my prime choice. As it does both down and forward view depending on position of the pivot point.