Thanks Oliver for the Information,
with you I've learned a lot of things 
... So, I think that very soon I will pass to Arduino Mega 2560 because the menu is very useful and I will introduce more menu ...
What I was thinking for the future is use another kind of Display (maybe touch) to use with your great library ...
So from your experience could you kindly advise me, which kind of display to use ?
thanks again for your support !
Gnux