How many GB of Data would I need?

I'm thinking about getting an iPhone 5 but I would like to know how much data I should get monthly. If I got an iPhone, I would OFTEN be on twitter, instagram or just using the web. I would use pandora a lot as well. I have Wi-Fi at home and at my friends houses so I could connect to Wi-Fi whenever I'm able to. How much data should I buy?

Added (1). I'm with AT&T

Unlimited. Prepaid is the way to go you don't pay fees extra taxes and their plans are really cheap. I pay 40$ a month unlimited everything 3g is plenty fast for streaming Pandora and YouTube. I also have the exact same coverage as anyone on T-Mobile. If i had switched to this years' ago i would have saves twice as much.

I don't have a KiK… But you can message me or email in my profile

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