that seems to be the hot topic lately... it really depends on alot of factors. The lift kit installed, tire size, offset of wheels (if not stock), etc...
I had spacers on my Jeep when it was stock. My intention for the spacers was to get a wider looking stance and improve handling of my Jeep. I def was able to achieve both of my goals once i installed them. I got mine off ebay from CJBargins... 1.25" billet spacers. And to be honest if i didnt have spacers installed i really think id be rubbing on alot more than just the pinch weld. But that's just my opinion.
I would say go for it, but i'm sure other guys here will chime in fairly quickly to debate my view about running wheel spacers.
DING DING DING!!