I don't need LTE in the iPhone, until 2013, where it'll actually be existent in the UK. But, I do appreciate that a select few have LTE converge in the US, and some have it coming to their area, in the near future.
LTE won't really be useful in the UK, until 2013; LTE is useful for the 1% of US people that have it.
The dealbreaker, for me, will be the screen size; contrast, brightness and black is black / white is white; and, finally, iOS 5 ... for the iPhone 5
For the iPhone 6 / 7, I'll probably have LTE in my area, and, therefore, would like to be getting for what I pay for (in the contract), assuming LTE is more expensive than 3G, and you're forced to get a LTE contract, with a LTE phone.