Length of a jib/street board?

I got a burton dominant in a 159 for riding the whole mountain. I wanted it a little longer because I thought the 156 would be a little small for all mountain (5'10'' 200lbs). Next year I'm making the burton custom my mountain board and the dom my rail jam/street board (if I come across a nice rail or ledge or something). I know the 159 is a big jib board, but will it make urban stuff a lot harder? Thanks.