AV8 is 100% correct. Rock rails are very important. I'd be seeing if I could find something cheaper than the $2400 Jeep are asking for them, but at the end of the day, $2400 is still cheap compared to what it will cost to repair your sill panels when they get damaged. My WG Grand Cherokee rock rails cost $800 imported from the states. Best $800 I ever spent as I've landed on them quite hard a few times now. And I do say 'when', not 'if'. With a car that low, it will get hung up on a rock when you go offroad regardless of wether you don't plan on doing any rock climbing. Offroading is just that. There is no road, and you will be faced with having to climb the odd rock to continue with your journey.
Mate, congratulations on your purchase. I look forward to hopefully seeing you out on the tracks one day. I like the KJ's and will be interested to see how it performs off the blacktop :-)