Thanks everyone.
The point is that I
really don't need an mp3 player, 'cause I already got one, but I wouldn't mind upgrading.
On the other hand, I can't buy an iPhone (which would be the ideal solution) 'cause I'm tied to the mobile operator until sometime June next year. (Moreover, I'd like to wait until an hypothetical new version next year

).
I find that every time I go to my brother's, I always pick his iPhone to see what new little games he's downloaded.
Thinking I could go with just an mp3 player until I can change my mobile, I was hesitating between the iPod Touch or the ZuneHD, but the last one seems is less focused on games (and not available in my region).
Argh, anyway, I still don't know what to do.