I don't know what I am doing in this thread, with all due respect to the OP and all others who think this is a great idea.
"Pretty much looks as if they're listed in terms of price..." is anyone surprised by this? Each manufacturer produces a line of product that caters to specific market groups. Generally, a bottom end, various middles and a top end. Now there will be discrepencies and variation in this, and in regard to headphones considerable opinions that will deviate from price only, however because these opinions can not be evaluated objectively (even by majority rules, if it were possible for everyone who comments/votes to listen to every model) you will only end up with a price based tiered system. You would need to construct a matrix rather than a list to even attempt to accomplish an inventory that was useful that extended beyond price only. This matrix would need to include various preferences like: isolating, darker bassier sound, brighter fatser sound, airy, efficient, power hungry, and would need to include portable source through to well amped system etc etc not to even mention music genres. Headphones and sound preferences are subjective. There is no best. And creating a better to worse tired system will result in a price list with several (many) disguntled headphone owners completely disagreeing with some placings. This list will be no more helpful than a list of best cars/vehicles, which would also end up as a price list, probably divided up further into categories-off road, people mover, city run about, sports car, tourer etc.
People accept that headphones are subjective, that preference plays a major part, and they also accept that with some exceptions, (both the over piced and sonic bargins) price is a fair indictor of where to start with the next decsion on the headphone journey. We should not encourage a list of from best to worse in my opinion, we should identify what people are seeking and make helpful sugestions reagrding meeting those needs, based on our various experiences and preferences. And that is what Headfi does, sometimes well and sometimes with confussing conflicting views. But hey, that is what opinions are all about.
Good luck with your list.