If I could only own one reptile I would pick a lizard, and in specific, a savannah monitor I think. They are my "one day when I have the proper set-up" pet that I am dreaming of.
Don't get me wrong. I love the snakes. My emerald tree boa is gourgeous, my ball pythons are a pleasure to handle, and my cornsnakes are great little garbage cans and fun to watch cruise their enclosures. And I love how low maitenance they are.
I just feel I'd really be missing something without a lizard around.