Shout out for The Dread Ilk Reads, a book discussion group reading Aristotle's Rhetoric. I've been interested in the topic since reading Vox's excellent discussion of it in SJWs Always Lie and diving into it deeper is a great opportunity.
Here's a link for a free version of W. Rhys Roberts' translation, which I've found quite clear and readable. Any translation is fine for the reading group, but this one is quite easy on the eyes and brain.
I've been using this Kindle version ($0.99) since I like to read across a number of different devices. Many classics end up poorly formatted and typo-ridden on Kindle; this version is mercifully free of defects.
Here's looking forward to fruitful discussion!