I went into America Tire Co today to get my tires balanced and rotated and they measured the tire tread. The fronts measure 8/32 and the rears were 6/32 (he said the NTG start at 13/32).
He said that basically translates to ~30-40k more miles! I don't know if I believe him or not, but it any case, I won't be changing the tires at this time.
I also told him I wanted to explore other tires, and he said, "If these work for you, then stick with them." Same thing that most of you guys have said.
Thanks again for your time guys.