I've used Red Sea Coral Pro... the wholesale distributor for Tropic Marin, but going back to Scripps.
Making r/o water is expensive these days with the drought.
I use Scripps. I did some reading on old tank syndrome a while back and came up with some very informative articles on salt mixes and sea water. Rather than try to explain them in 50 continuous posts...I'll just link the articles. MODS, if the links are deemed inapproplriate, please feel free to nuke them. There is a TON of great info in them. They are all saved in my favorites, so if they get deleted just PM me and I'll be happy to email them to you individually.