Antenna Adaptor (splice the blue wire into the blue/white wire on the Pioneer harness or you will not get good reception) :
Amazon.com: Metra 40-NI12 Nissan 07-Up Antenna Adapter: Car Electronics
If you want to keep the steering wheel controls (you have to splice this into the VEHICLES side of the harness and then plug the 3.5 mm jack into the "wired remote input" of the Pioneer. Most people (myself included) need to do the manual programming to get it to work, but that is easy):
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
Parking Brake Bypass (even if you will never watch a movie, get it to keep full functionality of the phone features while driving):
http://www.amazon.com/AVH-X1500DVD-A...bypass+pioneer