Congrats on the IX. I DD'ed a plastic bumper swapped 2.7 (327i) 1988 325IX for almost 7 years. It's an animal in the snow. I've had jeeps, audis, and subarus, but nothing really compares to the IX in the snow. Just make sure that timing belt and water pump are fresh. If you dont know for sure, do it now. I probably have spare parts laying around that you may need some day.
I'd love to have that jeep, since my IX got totaled in April and all I have is a Z3 2.8, but I have to sell a set of porsche 993 cup II's and a Z3 hardtop before I feel comfortable buying a winter car . Never had an xj, and the 2 door is quite a looker.
Good luck with the sale!