On the killing of darlings

The hardest thing about writing a syllabus is the editing down. Last semester, I had the gall to actually edit the Iliad (and I questioned throughout the course whether I'd done the right thing, though I'm happy I included all the supporting texts I did).

But this time it's even worse. There are stacks of texts I consider essential to a course in Classical Philosophy, and only a finite number of classes in the semester. Must I sacrifice the pre-Socratics in order to include Seneca and Epicurus? But the pre-Socratics are so nutty and fun! And how can we read the Republic in its entirety if it means sacraficing either the Crito or the Apology? And what about the Phaedrus (my absolute favorite)? Aaaaugh!

So, brilliant readers: what texts do you think are absolutely essential readings in Classical philosophy? What shouldn't students be allowed to live without?