Leucistic Texas Ratsnake wins my vote! I'm partial because I own a 2 year old female. She was nippy at first, but settled down well and is a great easy going and easy to care for snake. Gorgeous to boot! She has a lot of personality and expression for being a snake, I love that.

I'll share that I like seeing her in her tall terrarium, a 29g. She loves to climb and it helps with her size. Though she's not a hatchling any more, but if she were, a 20L would be nice.

Oh, and Taiwan Beauty Snakes are hot too!

Whichever reptile you go for, have fun filling that tank!