good, reliable salt . . . Instant Ocean. Even better (IMO) . . . Reef Crystals. Same salt, but -- has more calcium and trace elements in it.
Pick a good Calcium and Alkalinity additive and stick with that and a good salt. I completely don't even have the slightest idea why people make this hobby more complicated than it has to be with the use of tons of additives.
I use Seachem's Reef Builder for an Alkalinity buffer (which incedentally also maintains pH at 8.3 through long term use) and Reef Advantage Calcium (which also adds magnesium and strontium). I have used these products for over a year now and have been satisfied with their ease of use and effectiveness. Furthermore, they are very inexpensive and readily available.