I have had the factory toyota nav and have currently switched to the eclipse 6610. Both are very good units, but for the price you get alot more function out of the eclipse models. The eclipse model plays dvd's has full ipod controls, tv tuner, HD radio, and a couple other features that the factory nav does not. And the best thing is, eclipse makes the factory toyota nav's, so almost all wiring is direct plug and play, (although their software is not compatible ). The only thing you need is the bypass harness for the jbl amp, which is pretty easy to install. My model also features a dual zone selection, so kids can watch a movie in the back (with headphones)and me and the wife can listen to the ipod or radio up front. It depends on what features you are looking for in your nav unit. Price for the toyota nav's from oemvalue.com run $1700, (last time I checked) and I think I paid around $1600 for my eclipse 6610. I do think that the fit of the toyota nav is better than the eclipse but thats the only plus.:tu: I have also heard good things about the pioneer avic-z1, (better grapchics). Do some more searching. Good luck!