Its the most costly, but in terms of functionality, the Nissan OEM lights are the way to go. I had an aftermarket HID kit in my 97 Maxima and while it was very bright, the beam pattern was not very good, since the light assembly was originally made for halogens. So, in order to get the max benefit from HID's, and their wide range of illumination without blinding everyone on the road (I was always afraid the aftermarket HID's pattern was so scattered that I would blind oncoming traffic on a road with no center divider), the expensive Nissan kit might be the way to go.
When I purchased my Murano, the HIDs and VDC were the two most important items I made sure to get. Unfortunately it also meant paying $3500 for the SE popular package, most of which I didn't really need (esp the non upgradable BOSE system!).