I am visting San Francisco for 6 weeks.
My problem: I am badly addicted to working on the big 27" apple screen.
What I am looking for: a solution where I can use the screen for a period of 6 weeks without paying a hefty price of ~$1000
I have seen a couple of websites which are renting the screen, but they are charging around ~$750 for one month. It would cost me the same to buy a screen.
Might be crazy, but (as you've seen) these displays have good resale value. Perhaps you could buy one at the apple store, then resell it via e.g. Craigslist when you leave - I bet it'd cost less than renting it.