Pay whatever you feel it's truly worth to you. Obviously since this is the one that you want and it's not far from you (it's convenient) and you get to have it now... let those factor into your decision.
Keep in mind that Jeeps are very popular and it's not everyday that one finds the exact one that they want within distance and at a decent MSRP and invoice price. Don't be afraid to pay a little extra over invoice to
a) have it today
b) take it off the market now
c) not have to wait any longer, let alone a few months for a factory order.
$500-$750 over invoice would be an honorable deal, especially if the dealership and salesman have been good to you. But if you judge what others have paid as a baseline for what you think you "should" pay, you're in for a gross disappointment, frustration and dissatisfaction.
I would go with 3-4 percent under invoice. If there is a certain jeep you want and you want it right now you probably arent going to be able to get the best deal possible. But who cares? If you like it, and you want it then go for it! Remember invoice is just another number,,,,, dont let them say they arent making any money on the deal.