Hey Dead-heads (I hope that is not a derogatory term !)

I have recently got into Phish and although I have always heard of the Dead I have never really spent much time listening to them.
SO, I have been listening to Billy Breathless and The story of the ghost, both of which are very cool.

I want some recommendations, what Dead records are good to start on ?

Any input would make me smile !
Cheers
S