I use H2Ocean and Reef Crystals with great success. Having a high SPS load I do still have to dose Alk and Calc but never dose mag. It really dose depend on your tank's uptake of the various chemicals. If your tank doesn't consume as much all or Calc you can probably get away with the higher level salts.
Best thing to do is pick one and try it out. You'll know fairly quickly if the levels in the bucket are adequate for your tank needs.
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