I finally got tired of that priest too... since my archery/sneak was so high and with added bonus' of a necklace,ring and circlet I snuck up onto the roof of the Temple of the Dead (it's low and the main roof blocks the view from every other direction) and then in the early evenings before everyone went to bed... I hide up there, knock my sharpest arrow, and waited until all the guards and people were looking away from me and him... and loosed the arrow. One shot and he was all done preaching and no one knew who did it.
I then jumped down from my perch and walked over to him, picked him up and set him on the bench near by like he was resting
In Whiterun there are the two redguard mercs standing at the front gate, I've tried to pick them off with bows, but there's just to many other people around and no real good hiding spot to take them out. Oh how I wish you could load two arrows and shoot two targets at once! LOL
So, I did the next best thing. Waited until 2am, parked my follower in my house, went around back and in the shadows out of sight of everyone, turned into the wolf, sprinted around the house to the gate, slaughtered one, opened the gate and ran off into the fields behind the town, changed back, put my gear on and went back to town. then did it again for the second guy.... no more redguards.
The guy that works for Belethor never bothered me, but that guy outside the store, I think he's a Grey-Mane, bothers me... he might have to get an arrow.