You should manage a 380 quid for a factory unlocked 32GB. I fix them for people and buy broken iPhones and sell them on once repaired. if i were you i'd not take less then £350 though and thats my idea basically once the iPhone 5 appears although awaiting to see what issues it has if and when it is releasedin the uk and other countries apple stores that had the iphone factory unlocked the phone was around 800+ euros and i paid 600 uk pounds for mine 32GB so i expect very similar prices for the 5, hopefully cheaper as if i decide i want the phone i will sell my iphone 4 and i can only get around 300 for it so hopefully apple will make it cheaper lol
Probably if i use Ebay yes but i am just going by what i was offered on Enviro phone. But the more the better really because if i decide to go with the iphone 5 i would end up having to make up the rest myself from what ever i make form the 4 unless i get a o2 contract or something.
but once the iphone 5 is announced i think depending on if its good or not then we will see a lot of people trying to sell their 4's to get the 5.
currently the beta 5 is set to expire on the 29th September so it seems we are very close to the end of the betas of ios 5 i would guess 7-8 betas for ios 5 now.