Need help with ideas on which GPS head unit I need and can afford

[13razorbackfan]

I have a 2005 Ford F150 and the factory unit is 5 1/4" in height and 7 1/2" in width which makes the diagonal total width 9" even. I need a GPS unit that also has a CD player, upgrade-able GPS with SD card and a unit that has pretty good sound. I was looking at a Kenwood DNX572BH and they are roughly $600 and the screen size is 6.2". I was hoping to find something bigger but really don't want to spend over $600.

Any help guys would be really appreciated. I use this truck as my lawn service vehicle so I really need an accurate GPS that does turn by turn directions, etc.....

Thanks

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