I vote for 35's you shouldn't have any problem with tba 3.6L engine. Personally I don't care for body lifts, and you really don't need them with the JK's.

 

On my 2007 JKU i did 2.5bb lift with an added 3/4 spacer up front with 35s on 4:10 gears. as a daily driver with moderate off-roading on the beach mostly...looked good with zero rubbing....i chose the BB over a coil lift to keep the factory ride as most coil lifts stiffen the ride to some degree.....down side, power and gas mileage went to crap...i didnt realize how bad till i got the new jeep...now you have the new engine and i didnt in 2007 so im sure it will help...but your running 3.21 gears vs the 4.10 i had....i think the engine vs the gears are a wash...my new 2 door feels like a Porshe compared to my 2007 you can run both tires on the stock wheels in most cases altho some tire dealers wont put a 285 on a 7.5 wheel as we have stock for "safety" reasons...see link below and see rim width 8-10 for the same tire size Druatracs...look under specs tab

http://www.tirerack.com/tires/tires....mCompare1=yes#

the 275 65 18 rim size is within the safety range as seen here:

http://www.tirerack.com/tires/tires....mCompare1=yes#

it does not mean you cant find someone to install them...more than likely they will if they are getting a tire sale eh? this is my old 2007 with a 2.5 lift on stock tires and 18 rims:



and here it is with 35 12.50 tires

 

I agree with Bamo....

I'll be getting 35's soon.

This is mine with 315/70R17 Dura-Tracs....




Plenty of room w/o a body lift. Now that I have flat fenders, maybe I should look at 37's