I'm always a fan of Clairefontaine notebooks and for some reason, I really like the Basics series. They're just straight forward, no nonsense, and can be professional and/or fun, depending how you use them. Because the cover is plain and black, it's also super easy to fancy it up myself with some Sakura Gelly pens or something!
blank Habanas might.The paper is very smooth. As such, some fountain pens may not write so well on the smooth coating - an issue I was surprised to find with a Pilot Vanishing Point.
Match it with an Age Bag for a really good look!
Writer's Bloc - $10.45
Some people are passionately against expensive paper. I am not one of those people. At $10.45 for this medium-sized notebook, it does carry a premium. But when I practice calligraphy in here with a scratchy dip nib and some gorgeous pearlescent ink, I'm as happy as a clam, so to me, it's worth it. I found a way to make the wide rulings work for me (as I FAIL to practice calligraphy properly on blank paper... it ends up all over the place). And the Basics series can be dressed up or down, however you like it. If you haven't tried Clairefontaine paper yet, you really should.