Your SAT total is 1640. You'll probably need to get it up to around 2000.
By the time you apply, you should have at least a 3.6 unweighted, unless you have a crazy difficult schedule, in which case you can probably go as low as a 3.4 unweighted.
If your very serious about attending GW you should definitely visit and interview, or even apply ED. Interest plays a large role in admissions. I know quite a few people from my school who were much more qualified but got turned down, probably because they didn't visit while I visited twice.
Your ECs are good enough; they won't help you or hurt you. Unless your a golf star.
Your major is also going to play a factor.