Need Help Buying A New In-Dash Navigation

Hi, Guys !! I'm new here...I just need help buying a new In-dash navigation for my 2007 Toyota Camry SE. I want to get a good navigation that would look good in my dash, and i need an advice from you guys in which model to buy...I already checked some models out and these are the ones i liked (Avic-Z2 , Avic-D2 and Avic-D3)now...I want to be able to use the navigation and play movies while driving. I went to a dealer and i asked one of the installers there and he told me that the Avic-Z2 Can't be bypassed....There's no way!!! He said...he told me that the Avic-D3 can be bypassed...easily. I like more the Avic-Z2 then the Avic-D3 because of the knob on the D3...but Is the D3 a better choice? I think the knob it's not a big deal, i think it would look good in my car anyways. What do u guys think ? please help me select the perfect In-dash Navigation for my car... Please Reply, Thank you...