If you do not mind I would like to pick the Apology:

http://www.classicallibrary.org/plato/dialogues/12_apology.h...

It seems that it is the most accessible text. In my opinion it goes beyond the limits of philosophy and it becomes real poetry.

I found "The Clouds" rather entertaining. Unfortunately the language in the free version is a little less frank...but it's an interesting read nonetheless.

http://records.viu.ca/~johnstoi/aristophanes/clouds.htm