I just recently installed an MSD 6AL, high vibration Blaster 2 coil, Accel wires, Ford TFI dist. cap and rotor, and regapped the plugs to .055 and it made a noticeable difference. I can feel a little more power and the engine runs much smoother. Depending on the way you use your Jeep, you can usually find the 6A for $130-$150 whereas the offroad version is around $230-$280. I got mine for free so I went with it but I wouldn't see any real need for the offroad unless your Jeep sees a lot of offroad time.
'85 CJ-7 - 258 bored .030 w/ mid level cam, 4.0 head, Clifford intake and header, Weber 38, TFI w/ MSD 6, Black Diamond 3" lift, Daystar 1/2" lift shackles, 33x12.5 Goodyear Duratracs with stock 3.31 gears.