yeah, barcelona is a lovely city, skaters are too:)
who cares about lenses, anyway, you are close, zenitar 16.
I dont like fisheye too much, especially for streetphoto, unfortunately i spent half a day in Prague, and only few pictures i did, unfortunately with fisheye...
But for few subject fisheyes is really good, like skaters and for punkrock/hardcore kids/music:)
cheers, Jan