I don't have much experience with the Navi HU. I have heard good things about the Pioneer stuff. People on this forum talk lot about the kenwood HU's, I personally have no experience with them.
As are as sound goes, it is hard to beat a component speaker set. 2 way works fine. They can be had for relitively the same money as a higher end coaxial speaker. If you shop around you can get a decent set around the $100 mark a nice set for $100 more. Are you looking to put an amp or run speakers off your HU? Are you going to run a sub?
Are you installing yourself or paying a shop to do it? That really affects the budget.
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