I am looking at the Lowrance HDS 10 and there are choices.

Do I want a 50/200 or a 83/200 transducer for crappie fishing?

Do I choose Expanded US Basemap or Insight USA?

I plan to purchase the Structure Scan also.

Are there any other choices that I will need to make to get the correct unit for crappie fishing?

What are some of the better (economical and reputable) vendors to purchase from?