My mom and I were splitting the cost of the 13inch MBA. I wanted to follow the advice of the people here and configure it to the 8gb ram online. But she doesn't want to use her credit card online because of previous experiences (someone, somehow, got a hold of her number). Should 4gb of ram suffice? The heaviest things I will do are using garageband and playing Valve games (half life 2, left 4 dead etc).