Hello & thanks a lot for all your valuable answers.
David, you are right and I have no dreams with winning with stamps. Regarding the modern ones, I think one have more chances to win at lottery that making a fortune. At least for sure not for somebody like me that have no desire to invest money but just spend some money for my pleasure.
I also took a lot of time to see the stamps, find out the philately shops over the net. A good and valuable source was this one:
http://europa-stamps.blogspot.com/ because from there one can go to each country philately shops.
I also tought to go on with countries with stamps I like. As candidates I have choosen italy, france, gibraltar, finland, NZ, Rusia, Ireland & Iceland....
The stamps have good designs and (except France, that is a mistery for me... 8 booklets in one year ?!?!) they are not really expensive countries.
As they are still quite many i'd have to reduce the number of countries by half... so i'm still evaluating.
Cheers & thanks!
P.S.: Even so, I saw Romania 2009 sold on
ebay Austria for 170 EUR after a good battle so sometimes it can go good (sure,beyond the SF catalog price but better than the face value I think). Why was so... I have no clue. I think it was just on the right time there.