| What other factors do you want to consider?
For example: Setting? Would it be better to have a more modern setting, a fantasy setting, or a futuristic setting?
How complicated do you want it? Some systems have more math to consider and many things going on at the same time, others have less.
Are there other concerns, such as violence or non-violence, etc?
Off the top of my head, though, I would recommend Star Wars Saga Edition. The fantasy is 'socially acceptable' for more people, the system is clean for the most part, and you can model it with movies first if necessary. | 
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