last year I had a 2012 altitude edition JKU. I installed a 2.5" RC coil and shocks lift and ran 35" x 12.5" tyres on it with no spacers. I did have a bit of rubbing at max flex but it was predictable and I could live with it.
I sold it to get a 2013 JKUR and this time i am only getting a budget spacer lift, keeping the stock wheels still, but installing spidertrax spacers.
Like someone else said, buy good quality hub centric spacers, use Loctite and check them when you rotate tyres and change oil. Spacers have theur share of haters out there but most of it is just people's opinions, not always based on factual info...
all that to say, that you can fit 35" without spacers with only a bit of lift. hope this helps.
"SOLD" 2012 JKU Altitude, 2.5" Rough country, 35" Dick Cepek FCIIs, Kargomaster Safari rack, ARB Fridge freezer, XRC rear bumper, RC hybrid stubby front bumper
2013 JKU Rubicon kargomaster roof rack, AEV front bumper, 35'' Kumho Kl71s on stock Rubi wheels, Spidertrax spacers, RC BB 2.5 lift