If we are to send a limited number of us out into space, then there's the potential of a bottle neck effect which means you can clean out a lot of our genes that way. That can lead to a very low genetic diversity in the colonists. If I designed such a project, one of the first things I would think of would probably be that we should try to include as rich a variety of good genes as possible and try not to bring along bad genes, like those leading to genetic diseases like sickle cell disease. In a small population, those can really start to crop up.
It is also important that the people going are social, empathic and wont to cooperate rather than cause conflict. This is because the shuttle environment itself might promote conflict and so it's important to send people who are less likely to react to it in such a way. And, of course, cooperation is necessary for successful completion of their mission with resulting establishment of a human colony somewhere else in space.
So I think the perfect participants should be varied in genetic heritage, very healthy (genetically, physically, mentally, socially) and have great social skills. Whether I would be a good candidate, I'm not quite sure, but at least I might be suitable as someone who likes to cooperate, gets along nicely with others and who is not likely to start conflicts. Imo
edit :
Of course, with a diverse heritage, the people going would also represent more of earth's global human population on their journey for survival. I'd root for them, even if I wasn't on board. My genes would have a lot of close family on that ship anyways.
