Above-coil spacers keep the exact same ride quality and wheel travel, but add a chance to damage the shocks in extreme wheeling unless you modify the bump-stops.
In-coil (preload) spacers affect ride quality and reduce wheel travel, but there is little chance of damage. This requires taking the assembly apart and a spring compressor to put it back together.
Either will serve to give you a little more ground clearance and wheel-well clearance. This is for looks and moderate off-roading in dirt, mud, and some rocks. Neither is good for hard off-roading in rocks, but it doesn't look like that matters to you.
If you are happy with the factory ride, and aren't doing any hard wheeling over rocks or drops, then a $150 Daystar 2.5/1.5 above-coil spacer lift/level from Amazon will probably be all you need. You can install it in your driveway if you have the tools.
If you want a better ride quality then as mentioned a set of Bilsteins would be a huge improvement.