lol @ 'light weight'... I'm heavier than most other girls that I meet. :P The reason I'd asked about the 154 is because I found a great deal for one on craigslist, but if it's too short, it's too short. Also found the Prior Brandywine (which I've demo'd and liked in a shorter length) on sale in a 158, and it sounds like that might be okay? I'd probably be mostly riding in the Cascades such as descending from Camp Muir, Baker, St Helens, Sahale, etc.
PS - Snowolf I saw your St Helens trip report. Great photos! I was there two days later and it was all clouds and fog and wind and rain.