In my opinion, a standard continuation bet should be about 1/2 to 2/3 of the pot and that should not change based on the value of your hand, but rather the texture of the flop and how many draws are possible. There are rarely times that I see a pot sized bet as necessary.

Greg Raymer had always said that the best bet to pickup the pot in this situation is the absolute least amount that will get your opponent to fold.