I was looking on ebay for some cool things that i can do to my car when i get her, i saw one of these in a car i was looking at importing and i have checked the cost and it's pretty cheap for what you get
http://cgi.ebay.com.au/7-DOUBLE-DIN-INCar-NAV-System-GPS-TV-DVD-Bluetooth-MP3_W0QQitemZ170299270476QQcmdZViewItemQQptZAU_Car_Parts_Accessories?hash=item170299270476&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A1|39%3A1|240%3A1318
Would there even be room for it in a 260z?