George,
which process would you like to try? Papers are suited differently for different processes.
Generally, I would say forget Arches watercolour for metal salt processes. Arches Montval is a cheap paper which is, if i remember correctly, not totally unsuited, but there are better ones. I don't know Fontenay nor Fabriano Rosaspina, but Artistico is good for some processes, though it is alkaline buffered (you don't want this for most processes), as is Saunders Waterford. I use it frequently, but I would not recommend it to a beginner.
Whatman Watercolour is, for al I know, an expensive but quite good paper. I have not used it for a while, but it used to be not buffered.
Generally for metal salt processes, I would go with hot pressed papers.
Choises for gum prints and the like may be quite different. By the way, there is no reason why you should order a paper in Greece.