I have the Yakima Load Warrior which is an awesome basket. It looks great and it looks perfect on top of my Pathy. It has nice lines and it's pretty contoured and it gets the job done! I would recommend getting the extension for it tho. I don't have any lights on it yet but when I do put lights on it, I'll use the same ones on my light bar, the new PIAA 520 ATP lamps. It's their new all terrain pattern and I love it. Yakima also sells the spare tire carrier for the Load Warrior which I also plan on purchasing in the very near future. The spare tire carrier fits a spare up to 35" and it would look badass with at 31" spare on top of your QX4.
The entire setup will run quite a bit, but will look amazing. To mount the lights I don't think I would use Yakimas light mounts for the Load Warrior, they're kinda big and ugly and they don't mount in front of the basket, they mount on top of the basket. Don't pay attention to the prices in the links below, you can usually get them for about 20% less by searching around.
Here are a few links....
Yakima Load Warrior:
http://www.yakima.com/racks/ca....aspx
Load Warrior Extension:
http://www.yakima.com/racks/ca....aspx
Load Warrior Tire Carrier:
http://www.yakima.com/racks/ca....aspx
PIAA 520 ATP :
http://www.piaa.com/Lamps/Lamp-pages/520atp.html