Axiom Transducer / Sonar package selection

I have a Axiom with the transom mount transducer. I'm not satisified with the performance of that transducer, and I'm having an issue selecting a transducer that will allow me to see Depths up to 5000 feet. I understand I may need a sonar box as well. Please help with with my options as there are so many. Dual transducer, different sonar boxes. I do slow and high speed trolling, and deep dropping. So performance is important to me.

Thanks