I got Heavy springs all round:
front: N196 Shock, OME621 (heavy)
Rear: N198 Shock, OME618 (heavy)
Panhard rod: FK39
And just to confuse things:
Mine is the exact same setup as JKhon (ARB bar and Warn winch) yet I have the Heavier spring up front (if the higher the number the heavier the spring) yet my front dips??? In theory mine should sit up higher at the front