Wow. Great suggestions here. I would definitely second (or third or fourth - whatever): Jimmy Corrigan, Persepolis, Cages, Maus, Fun Home, The Dark Knight Returns, That Yellow Bastard, Watchmen, Top Ten, V for Vendetta, and The League of Extraordinary Gentlemen.
I'm glad my number one recommendation hasn't been listed yet, so I can at least feel somewhat useful. Black Hole by Charles Burns would be my number one pick. Amazing book - and a great book to dissect AND enjoy.
I'd also suggest:
Daniel Clowes' Eightball and his stunning Ghost World
Greg Rucka's Whiteout
Gabrielle Bell's Lucky
Craig Thompson's Blankets and Goodbye Chunky Rice
Adrian Tomine's Summer Blonde and Shortcomings
Jeffrey Brown's Unlikely
Jason Lutes Jar of Fools
Seth's It's A Good Life If You Don't Weaken
Chester Brown's I Never Liked You
Jason's I Killed Adolf Hitler and Why Are You Doing This
Also, any collected trade of Fables (there are 12 I think) is a solid start (and Fables is great for dissection)...also, Y The Last Man by Brian Vaughn is a fantastic book and great for dissection - you probably couldn't do it all in a class if you were going to also focus on other things - but you could certainly get started with volume 1...
If the suggestions you got from this post are any indication - sounds like a great class!