Jwestpro
Explorer
I'd love to go as high as possible without destroying the ride quality
None, as in 0 lift, is the ideal amount. Now, to be clear, I am meaning for full time use. The very best height to be rolling all the time, and especially on the highway is the factory standard height. On a trail, you honestly have to get into rather rugged stuff to truly need more than the factory off road height. However, a little more can be nice/more convenient especially if you're sloppy or drive faster than you should for such terrain.
So, to get "a little more", the IIDtool is the simplest as well as having a multitude of other benefits such as resetting a code for your compressor or suspension fault that you will get for driving too high, too much. Like Blaise said, 25mm is plenty as this extra via iidtool. It's just enough.
There is more that you can do for actual lift, but there's no need unless you also do several other modifications for larger tire clearance. Your tire idea 265/65-18 is the simplest way to just go use the vehicle in a ton of places without introducing more complexity.