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If you know the exact lift you want, I would do lift, bumper, then tires. That way you can measure for proper sized tires for the lift and weight of the bumper.
A lot of guys here will say sliders are high priority because if you wheel before sliders and mess up a rocker panel, you're out some serious $$$. No joke. Sliders should be high on the list. You can tear up plastic bumpers cheaper than repairing your rocker panels.