Looking at my upgrades with Orange, the Samsung S3 (too big anyway) is £149.99, the Samsung S2 (also a bit too big) is £109.99, the HTC One X is £109.99, etc - basically all the top spec phones cost, while the rest are free.
And the brand spanking new iPhone 5 16GB and 32GB is also free.
Despite my best intentions, I actually considered joining the iPhone gang. But I probably won't, I'll shop around, plenty of people offering other options cheap as chips.
Wouldn't bother at all if my HTC Desire hadn't gradually been slowing down over the last few months to the point where even Paul Wellens would now give it a run for its money.