Hey Peety3 thank you for you opinion!
I understand what you are suggesting but i'm not a professional photograpther and more less a professional wedding photographer, me and this girl are both friends of the couple and passionate photographers, but i will not buy things "only" for the wedding or for the purpose of doing weddings. What i will "build up" in a year probably will be in the perspective of using it for the photography that i use.
I won't get a 10-18 because personally, for traveling - i don't like that effect and i don't use it - i'm really fine with 18-135.
The fisheye will be in for fun pictures and because the classic ultra-wide angle will probably be covered by the other photographer. Okay, maybe it will not be on the body full-time, but i need to organize that with the other photographer
The 17-50 is an idea in general, so i will keep an eye on it.