I've finished compiling my recommended purchases for our initial comics and graphic novel collection here at the library. If you're interested, you can take a look at it here (I apologize in advance for the crappy M$ Excel output).
You'll notice that it's a fairly broad list, as I was tring to represent a wide range of the world of comics. If you don't see something obvious on the list, it's probably because we already have it, or else I know that we're getting it through some other means and/or it's already in the pipeline.
Thanks to everyone who helped out by offering suggestions.
(To save you from having to count, the list is 400 titles long...)