Part II of the Videos Series 'Dragon in the Clancastle'
I'm not saying a dragon is the best choice for a high level Account, but for a TH6 it rocks.
Makes the base pretty much unbeatable, because the kind of attackers you get at that level don't know how to deal with it and don't have the troops that can.
So if you have a Mini or if you are a Low Level player, find somebody that donates a Dragon Level 3 or 4 to you :)
The good thing is that you can use the dragon for ~4 attacks (in my expereince), as it survives most of the attacks.
Part II of the Video series :
https://www.youtube.com/watch?v=2ulNhxugpSc
P.S.:
My Mini has gone to TH7 now, I will continue this defense tactic. Base is just extended a little from the TH6 one, but the same layout and a dragon in the castle. Will keep you posted :)