We bought these:
because they came with 5 in the set. Looking back, we wanted the 2" ones because the JK wheels were 6" backspacing, and our factory wheels were 4" BS. We have no lift, and they clear with a ton of room to spare, so we probably could have gotten by with the 1.5" or even 1.25" spacers. BUT now that we have the 2 inchers, there should be room someday for 285's or even 305's.....
Edit: I posted the wrong link above, I think I fixed it. Same seller sells 4 in a package, but charges 20 bucks more for the 4. Go figure.