Unless Garmin was forcing you to buy their products I can't see your point of view. You have many options other than the striker unit you mention. I use both Humminbird products and Garmin. Some things Garmin does better others Humminbird has the edge. Research an entry level MFD from another maker to see if one of their models suit your need.
If the Panoptix technology is in your future plans. Then Garmin would have to be your choice. If not then you have many good options.