What is best mobile network?

Ok here is my question I'm buying a iphone out right and am wondering what is the best deal at the moment I'm looking for a cheap tarriff that allows me to be on internet but will not cost alot with a decent amount of minutes too I don't really call or text much. Any ideas been looking around but not sure what's the best deal and is 30 day contract better than pay as you go for value? Any advise on current deals would be helpful I have been with o2 for many years but when I look around o2 seems poor value I used to work for them too does loyalty really do you good in the long run? Thanks again.

Added (1). One last thing which other networks are good and bad? I here from other people virgin is bad but others say good is it just personal opinion? How about orange and gifgaf and so on.

I'm currently on Three. Ultimate Internet SIM 200 1 month.

12.90 a month for unlimited internet, 200 minutes and 5000 text

Its one month rolling so basically you can cancel anytime without being tied down

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