That's a toughie-- I'm more inclined to go with your first temp, just because it was the one you got with the most sleep. It's obviously pretty low, and that's because of mouth breathing, I'm guessing, but your + OPKs and CM will also factor in to FF being able to pinpoint your O date, even if you have to toss away today's temp.
Just as an aside, I've had much better luck (and FF has actually given me real crosshairs the past couple cycles) with temping vaginally rather than orally. Just something small you can change to make it a bit easier to interpret your chart (yeah, sticking a cold thermometer up there isn't my first choice of things to do right when I wake up, either!

)