In CSI: NY, what are the best Danny and/or Danny/Flack episodes?

I recently got into CSI: New York and have fallen in love with the character of Danny, and subsequently with the Danny/Flack pairing (even if it's not really canon). I haven't been watching that long, and therefore haven't seen that many episodes, so I'm curious which would be the best to watch in regard to the character and/or pairing.