I've used the Merrell Moab Ventilator Mid (the non-Gortex version of your boot) for two years in the Sierra. Did the JMT with it last year. Great shoe, but can benefit from added cushioning in the forefoot. I cut down a pair of gel soles and installed the desired pieces under my insoles. Worked great on all that rock. No foot pain. Walked right through the creeks with them, and they dried before I stopped for the day.
CAVEAT: Any water crossings within an hour of camp at the end of the day are best crossed carrying your boots; they won't have enough time to dry and you'll get to put on wet boots to start the next day. YMMV
Having used gortex boots in the sierra in prior years, I can truly say you will come to regret the GXT. If (when) you get water inside them, you'll blind the membrane and they'll take forever and a day to dry. They also don't breathe very well in the warmth along the PCT.