I installed my lights bought from www.xenondepot.com They were more than $500 US. They were pretty easy to install. Here is a pic of my GX with the kit. They look better than most OEM lights out there.
My family just purchased a 2004 GX470 with navigation but no rear DVD. I want to know how I can hook up a DVD player to the navigation screen and make it play while the car is in motion. I also plan on installing a large screen (15") in back. Cheers!