Ive been torn between replacing my base model radio with a full size navigation unit, but after much research and debate, decided to go with a portable. I was pretty spoiled by the Uconnect in my Power Wagon, so I was a little worried about never being satisfied with a portable but wow was I wrong! I bought a Garmin 2798 LMT with a 7" screen and a wireless backup camera off Ebay for 260. The maps are incredibly detailed, with lifetime map updates. The turn by turn has actual Google earth images of the intersection. Built in bluetooth for your phone calls too. The more I researched the in dash units, the more I realized that you pretty much have to spend 800-1000$ to get one with a good nav system in it. I mounted the camera under my middle upper clearance light, so it covers a huge area, including the hitch for hooking up to my trailer. Overall, Im very happy with it!