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If you plan to run full slicks then yeah it's probably worth it.
You'll also have to think about bigger bearings and things, because the increased strain on them with slicks will kill them quicker.
If it's just for fun on track days, you have to think to yourself is it really worth it all...
You want to be looking at the 8kg/80nm/450lb range for track.
You can get away with a softer rear spring on a full coilover.
Harder springs on the rear are used on separate spring and damper setups. I'm not sure on the technicalities of it.