If you're saying "Philosopher or writer", Ovid, Virgil, Horace, Catullus, Tacitus, Pliny, Juvenal, Livy, Cicero and Martial. Of whom I suppose I find Ovid, Catullus, Livy, Cicero and Virgil enjoyable to read, others would disagree or choose different writers I am sure.

In terms of philosophers alone, I suppose only Cicero or Seneca would spring to mind, and Seneca in particular followed closely in Epicurus' footsteps (I think, it's been a long long time, please correct if wrong).

These are just people who I am aware are widely read today, I can say nothing for their barbarity or otherwise. I don't know anything about Plotinus, for example, and I don't even know which Marcus you refer to, so I am hardly a very reliable source.