The Trek 6700 has slightly higher-end components (gearing etc.) than the Rockhopper WSD. The disc brakes will certainly give you more stopping power than the specialized's v-brakes, especially in the wet. I've never ridden a bike with a RockShox fork, but they are a reputable brand. The only thing I notice is that 80mm isn't a lot of travel, but it's not an uncommon amount on an XC bike, and you get the same amount of travel on the smaller Rockhoppers.

Hope that was vaguely helpful.