So I want to get an iphone. Don't try and get me to get so technically superior phone no one's heard of - I went that route for years before getting an ipod and this time I want to get on the winning horse early.

But I'm having a quandry. On vodfone, contract up in Feb:

All contracts seem to be 2 years, which coming to the end of a 2 year contract is depressingly long

All the price plans cost the same basically but

Vodafone only has a 1GB data limit
Orange only have 750MB
O2 is unlimited but coverage is appalling (the lady's iphone is forever not connecting on weekends and such)

I leave my life in your hands. What should I do?