Since going to university two years ago, I've started using Moleskines for note taking. The paper is far from perfect, but the durable yet slim outer cover more than makes up for it. I find them absolutely delightful.
Here's my small stack of Moleskines:
If it's better paper I'm looking for, I turn to my Rhodia and Clairefontaine:
The Clairefontaine A4 pad has the nicest paper with the Rhodia A4 coming in a close second. The two Clairefontaine notebooks unfortunately don't use the same paper as the Clairefontaine A4 pad. I purchased them as possible alternatives to the Moleskine notebooks. The paper is much higher quality, but the build and design are much less so. The Moleskine notebooks stay open, but the Clairefontaine notebooks don't
I've heard that Rhodia has a Moleskine-like notebook, but word has it that the design is not as good either.
My search for a Moleskine-like notebook (stays open/closed, sleek hardback cover, durable binding, etc...) with better paper quality continues... Until I find this "perfect notebook", I will continue to buy more Moleskines.