rockyroad or sky i think, But why not go for a YJ lift? Just to much?
Deffinatly get a Hi steer conversion, the Z-link is a peice, the only way to go is full hi steer.
If you using The stock springs, most of the SPOA lifts are going to be the same, aside from Shackels, spring pads. You know those sorts of things, Im pretty sure they are all going to perform the same. Pretty much switching springs would be the biggest change.
Amilla