Do NOT stack spacers on top of each other, don't exceed 4" of lift unless you are running the SL kit as it will destroy your front end. Most people would recommend the OME lift as it is a full suspension lift and will give you the best ride. A spacer lift will give a more rough ride. With a 2" lift most people run a 265/70/17 or 255/75/17 tire.
2010 JKU - Stock for now
2005 WK - 6" lift, 35" BFG's, a lot more (SOLD)