With how intelligent most of the people are here, I'm surprised that so very few of you have realized that upgraditis has nothing to do with 'audio goals' and everything to do with internal mechanisms and the infinite choices out there.
The only people who say they've stopped upgrading are the ones with the most expensive headphones, ie orpheus, omega II, r10s. And then they still talk about getting a new source, amp, etc etc.
Pick up the April 2004 Scientific American. It has a great article about how we are faced with a greater amount of choice as consumers nowadays but we are less happy than we've ever been. The gist of the article is that the satisfaction we can get from a purchase will always be outweighed by its opportunity cost and the cost of researching it. You'll always wonder what else is out there, and the happiness and excitement a purchase gives you initially can never be maintained, so you start to think something is wrong and you need to uprgrade again.
How to stop upgraditis? Well, if you think that there is a piece of gear out there that can stop you from upgrading, you're going about it the wrong way. You'll always become habituated to it, somethign new will always come out, something else will catch your interest.
We've almost all of us hit a level of fidelity that is miles ahead of where we all started with our first pair of cans, but until you realize that upgraditis is internalized, and that you'll always get accustomed to what you have, you'll keep spending and spending and never be satisfied.
This place is a big magnifying glass being held to the part of our psyche that seeks to be happy from owning posessions.
ick.