I used straight peach for some butts...they came out terrific.
The next time I smoked butts, I used hickory, and was left with a strange sensation of "seeking" the smoke flavor while eating the pork...like the hickory didn't contribute much to the flavor of the pork, and my taste buds were searching for it.
Next time, I may try mostly peach with a hunk or two of misquite (I can hear my good friends from the Carolina's shuddering at the thought).