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It depends on what your looking for. Best bang for the buck, H.O. cams. If you are using an SCT Tuner or are tuned by a SCT tuner go with the 212 or 212x. If you are going to run boost, i.e. turbo or supercharger go with 224 grind cams.
H.O. Cams and 206 are pretty good, but you won't see a difference in the 206 cams without a cam tune.