What network should I go with on my iphone 4 for a lot of internet?

I'm just getting a new iphone 4 soon and I don't know what network to use (pay as you go) I use the internet A LOT but don't want to have to pay a lot?

Giffgaff - 12 quid a month, unlimited internet and texts and 250 mins. Also free calls to other Giffgaff people even if you don't top up for 3 months.

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