No, your not SOL, as mentioned by the other folks with 97+ Cherokees with power seats, you will get more head room, as we've all got the same center tunnel. As I recall on the test drives I took, the power seats in the late models allowed you to get the seat down significantly lower than the non-power seats. At 6'-0" tall, I was fine with the regular seats but I can imagine that it must be kind of tight for ya in there! See if you can find a late model Cherokee at a used car lot with power seats, and check it out before you invest the time & $$$ in replacing the seat....
[size=1][b][color=purple]2000 XJ SE I-6
5-Speed NV3550 Stick
Rusty's Air Tube w/K&N Filter
2" Lift with 30 X 9.50 BFG AT KO's[/size][/b][/color]