I'm going to have a custom fabbed dash made for my '03 es300, with space for a double din unit. This should enable me to later add a nav system in the slot, correct? For the time being, I'm looking for the best unit under $500 that has a usb or sd card reader slot, has a front aux input, and a really nice menu/control system...What would you recommend?

 

I looked for something like this and it seemed like Kenwood Excelon has a nice unit with all those features--