Daily missions! Not only will you get armoring, mods, hilts or barrels, and enhancements, but daily comms will buy you Rakata quality earpieces, implants, and relics. And you'll make credits and legacy points, too.
I made up a list for my guildies, you can see it here: Daily Missions
which you're welcome to read, just to be sure you're getting all the missions.
I haven't added in the new Section X dailies yet, but those are a lot harder, so you might want to wait until you're better geared for those.