Which snake to get after a Corn?

[DLreptile]

I plan on getting something at this summer's reptile expo. But it won't be a Corn. All I know is that I want a colubrid. I was thinking a Gopher or a Bull, but that hissing would be a turn off. I like Milks but which sub-species to get. Maybe even a Garter? King?

So what's the next step up? Think, something in the still-a-beginner-stage.. Thx.