For Filters, I recommend a 5 micron sediment filter and a 1 micron carbon block , ro membrane, and a DI resin canister.
Alternate option: Do a purtex sediment filter, 5 micron carbon block, 1 micron carbon block, ro membrane, and then pick up a DI chamber and convert your 3 stage to a 4 stage.
http://www.ebay.com/itm/like/121217771426?lpid=82
Salt recommendations:
IO Reef Crystals
Fritz Reef Pro (This is what I use)
Tropic Marin
Seachem Salinity (If you don't mind constantly shaking and rolling the bucket)