I think I speak for Steve when I say this, get a cyrtopsis. Who am I kidding! They're all really neat snakes in their own ways. Out of that list, I only have experience with parietalis and radix. Both very active and inquisitive snakes. Especially when compared to something like marcianus.

Pickeringii and cyrtopsis are very high on my wishlist though. Not sure what their temperment is like but they sure are something to look at!