That is too bad about Joe Miller's favorability numbers, I like when outsider types breakthrough and act with no fear once they get in (like Texas' Ted Cruz). Of course Treadwell would be a safe bet. And he would most likely get more help from the other Senator of Alaska around election time.
About the outside shot in Georgia you mentioned, there are enough good Republicans around to win that seat being vacated by Saxby Chambliss. I don't think it will be Karen Handel though, she has too much baggage now with some lies during her attempt to become Governor, and she had a few controversies since then. What I thought would have been interesting is if Newt Gingrich ran. He has baggage too of course, but I think he would be able to pull it off.