I have a 07 xterra with upgraded geolander tires. I'm putting a new bumper and winch on the front and I want to lift it as well. Any suggestions on lift kit brand and heigth? Or any further mods I need to do first? Thanks!

Depends solely on what you want to do with it. If you're just parking it front of the office to piss of your boss or show your co-workers you make too much money, then go with the spacers (about 2").

If you're wanting to drop some serious coin, take it off road and show your co-workers you not only have an X but use it to teach the rocks a lesson by shoving your door into it, then go with the big daddy 5"-6" lift to REALLY piss your boss off by parking on his Corvette (or his Corolla, I don't know where you work).