putting 150mm on your frame will screw the geo on it, making it fairly horrible on flat and general riding. Apart from issues like the headtube snapping, 150mm will probably get in the way. However, if you do only plan on launching off stuff on it then fair enough - but for any techy street riding 150mm will be a b****y nuisance... I would look at something like a psylo, or even better a pike (rockshox) as they have a very good range of travel settings - psylo:85-125 (or 80-125, not sure) pike:95-140.
I have heard a lot of good stuff about these forks, but the pike seems better if you can afford it. I want one!!....