As said before this place is huge!
I like their pen, pencil and sketchbook selections. They have all kinds of sketchbooks to choose from including moleskins and hand bound books.
There's a little library section with a cozy looking chair there, so you can sit and browse through books. They also offer custom framing and art classes.
I would put this above Utrecht, Arizona Art, Aaron brothers and Michaels. In that order... ;)