Personally, I wouldn't go more than 33's with your Jeep. Your engine doesn't have the power to push bigger tires with your gearing so 33's will be fairly dog-ish. And as imstillatwork said, to run 35's you will need to start looking at rear axle strength.
You also need to keep in mind that they higher you go, the more work you need to do. General rule of thumb is that anything over 2.5" of suspension lift and should get an sye and new drive shaft(about $600 on it's own). So at this point you need to look at home much you want to spend to get it where you want to be and you always get what you pay for in terms of suspension parts, so try to stay away from rough country.
I would go with an OME, BDS, or RE 2-2.5" suspension lift and a 1" body lift at the most. You can forgo the body lift in favor of TJ flares or flat fenders if you would like.
EDIT: ^^He beat me to it and I agree with what he says.
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