You should know that there are 2 types of lift kits available. There are body lift kits and then there are suspension lift kits.
While suspension lifts give you a bit more wheel clearance it is specifically designed to allow more travel in the suspension, thus increasing off road capability. It is the body lifts that give you serious wheel clearance, which allows you to run bigger tires and rims. Body lift kits are much cheaper than suspension lift kits.
I suggest you visit the forums on www.4x4parts.com
(also a great site to shop for Frontier goodies!). They have a couple threads that really detail the differences between the 2 lift kits.
As for me, I believe I will be going with the 3" suspension lift kit from Calmini and a 2" body lift kit from 4x4parts.com. Hope this info helps.