What are your goals? Did you just get your car (otherwise stock?)? If you're more interested in looks, coilovers can give you the dropped look and you can do the wheels to get a better offset with your coilover setup.
If you're interested in track performance, I'd say the S/C is a better place to start for a few reasons. 1) You'll have 6-8 months during the time you're saving to actually track your car and see what it can do without changing anything. 2) The stock suspension is quite good for the track. Sure you can do better with coilovers that are properly setup, but an S/C will put a much bigger grin on your face and improve your lap times much more significantly.
If you're worried at all about your warranty, I wouldn't S/C until the power train portion expires (5 years).
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2013 Cadillac V-Wagon, RIP Z
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