If you're still interested in getting a DVD/Navi system, the new Eclipse decks are such an easy swap into the camry's. The steering wheel control harness plugs right into it, no mods needed.
If you decide however to go with a reg CD player, you can use the PAC SWI-X
http://www.toyotanation.com/forum/t65712.html
I'm not sure if the other Eclipse Decks will directly connect to the factory steering wheel controls or not. I know the AVN unit's do though.
www.eclipse-web.com
I can get you the AVN5435 for around 1700 plus shipping. This unit will play video for the rear while displaying the Navi/Radio up front.