Help choosing snake

[Pr7sm]

I own a Corn Snake and unfortunately he has outgrown his tank, so i'm sending him off to my friend who loves all reptiles, now I plan on moving onto a juvenile Aquatic Snake. I want a nice looking one, that isn't too difficult to care for (or too expensive), I'm not extremely experienced as the Corn snake is the only one I have had and though I had no problems with him, I've never had a water snake. I have a 25 gallon triangular tank, which I'm assuming is a decent size considering I am going to get a juvenile. Any reccomendations? (Pennsylvania TBC)