Those are both fairly high-end shocks. Do you know why you want something that fancy? The highest quality shock in the world won't do you any good if you don't have them valved properly. Also, the higher-end race stuff expects more routine maintenance, probably not the best choice for a car seeing primarily street miles.
Hypercoil makes a good spring but there are others. The OCD types will measure their springs to ensure their actual rate is close enough to their stated rate. The lower quality brands are known to provide product with rates off by as much as 10-20%.
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