Truth is you would be best off on the 156. I am 185 as well (larger feet though) and have had some great days on that deck. You can easily ride either the 154 or 158, but considering what the Rook is designed for (soft flex, true twin, flat profile) going longer on this one does not make sense.
I'll probably spend 40% of the time in the park and 60% on everything else, so maybe the 158 wouldnt be so bad. How would the 2011 Gnu Park Pickle compare to the Rook? I can get it for the same price.
thanx for the help!