Well there's no way i can narrow it down to just one, so I'll name some of the species on my "dream list"
Favourite snakes: Diamond Python, Blackheaded Python and Green Anaconda
Favourite lizards: Australian Water Dragon,Red-eyed Crocodile skinks, Mangrove or Nile Monitor
Experience is a great advantage. The Problem is that when you get the experience, you're too damned old to do anything about it.