I used conical spring coil over shocks with 500 lb springs on my CR and it has a smooth ride while still handling very well. The large CR provided sway bar is also used. I don't have any complaints in the ride quality area with this setup.
The real value you get from these is being able to raise/lower the ride height for whatever wheel/tire combination you decide to use. The main extra cost is replacing the low control arm to one that accepts a coilover shock.