I just fitted the Rocky Road Combo lift (Daystar 1.5inch Spacer and their own 3/8 strut top plate) and can definitely recommend for the CRD. From what I read on the forums, and now also from my own experiences (I fitted and then removed the OME springs on the front), the Original Factory Springs with a Daystar Spacer lift of some sort is the only one to fit to a CRD. So essentially you have two choices
1) Rocky Road Combo kit and factory spring
2) Daystar 2.5inch Spacer kit (with the Daystar strut top plate) and factory spring
On the rear put the OME 947 or 948 spring if you are going to be hauling a load like a trailer/caravan/camper etc.
I've got Rancho RSX 17505 and RSX17004's on mine as well.