With your list of wants on the rudy "I" would do a diving pose with the wings slightly open. This would show the wings and legs and you could angle the tail somewhat (not all the way up) with the illusion of motion. To me I just don't like the look of the small "no neck" divers such as rudys and buffies in a preening pose. Another thing you probably want is the cool side profile of the rudy's head.....
On most GE's I get, the client usually wants them standing with the head fully fluffed to show off that aspect. I like to add a streaching wing so you can also show off the sholder stripes on a common or dots on a Barrows. I actually did one like this yesterday but he is wrapped up drying so pic's wouldn't show much. A simple hanging dead mount could also be cool. The problem with flying is they "usually" don't fly with the head fluffed up so you loose alittle something.
Just a few things to think about.