What I usually do is have a bunch of Shepherds, around 4 or 5, a colossus if I need more cargo, some drams or phaetons and other than that cheap maintenance ships with full HE weapons, frigates and destroyers, cruisers only if I have Apogees or Falcons.
The reason for this is that you don't want to face redacted when you aren't after them specifically, and what you usually face are Domain drones which have no shields, get torpedoes, get anti armor and go have fun. Carrying a bunch of large ships will eat at your profits a lot and will go unused way too often.