You are in a quandary but not a bad one. My first suggestion is a Blood Python. They are bulky snakes that will definitely go off the charts as far as "WOW" factor. They settle down well and would be great.
Another choice would be a Jungle Carpet Python. Placed in a tall cage with climbing space these things have got to be seen to be believed and they fit in your size requirement.
Hogg Island and Bolivian boas are also both very attractive slightly smaller boas. The hoggs even change color.
How about Rainbow boas? Take one out and put it in the sun and wow people with those prismatic scales.
If colubrids are your cup of tea I would go with a Brooks King. Large but not too large. Chunky. They are a garbage disposal.

Hope this helps,
Dan

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