I just got off the phone with a mechanic at my local cadillac dealer. He had no idea if the FE3 was an easy swap for the FE2. rather then get into coil overs I think for me to get the ride I want an easy fix is to change out the springs and sway bars. Talked to the people at D3, they have a set up..$429 for the springs and $695 for the bars (bigger bar up front but same size in rear, different material makes rears a bit stiffer). However, after checking Tirerack, Eibachs can be had for $253(lowers car about .8") and I'd probably opt for the bigger front bar only. Considering I have no intention of tracking this car I think this wouild be a good set up for the street.
Thanks to all for your input.