There are quite good quality paper notebooks in Europe, these are the ones I know:

Rhodia/Clairefontaine/Oxford - French, with one of the best quality paper I know. Not very expensive, Rhodia is the most expensive one, and Oxford the cheapest, often used at schools.

Miquelrius - Spanish, quite good paper, quite good price

Moleskine - Italian, the most expensive of the lot, and very famous, its paper quality is not good if you use fountain pens

Leuchtturm - German, similar to Moleskine and in several product lines, quite good quality paper.

Dingbats - British, very good paper, and they give a percentage of what they earn to projects related to nature protection. A bit cheaper than Moleskine and Leuchturm

Online - Another german brand, decent paper. In the Rhodia/clairefontaine price range

Do you know any other notebook brands from Europe? would like to try some more (bit crazy about stationery)