Dan Congrats on the XK trade !! Good Choice!!
One of my first mods were new tires as my KJ came with wrangler ST tires..they were crap.
I went With GY wrangler Silent Armor (kevlar belt) in 17'* and SpiderTrax 1.25 Wheel Spacers kicks wheels out a tad for handling/ Stability when basket is loaded.
So many mods...LIFT_OME springs, Bilstein Shocks, Jeepinbyal gen 4.5 upper control arms, Boiler'* 3/8 steel top plate spacer (to level front) Teraflex bumpstops,
F-150 high beam fog light mod.
Led interior puddle lights, PML 1.5 over stock aluminum transmission pan w/ drain plug.
Riddler Cast Iron rear diff cover with Lubelocker gaskets.
Setina Push Bar reinforced down to skid plate, Rola Roof Basket....etc etc...
Happy modding !!$$ Dan!