Sorry for the misunderstanding QQQ, when I say durability I mean which headphone will last the longest under normal use. For example, some headphones might have thicker cables or thinner ones...
Anyway, I've decided to add one more headphone into the mix - the Philips HP460. I really love its features - fold up, inline volume control, it comes with an extension cord, and 40 mm neodymium drivers (though I have no clue what neodymium is). Unfortunately there aren't many reviews for it, and from what I've read in the scanty selection of HP460 posts on head-fi, they sound good, almost comparable to the K81DJ's. Also from what I've read, they isolate well.
Anyone else have any insight on these? At the moment, I'm pretty much deciding between the Philips HP460 and the Senn HD202, and maybe the not-so-durable UR20, and have pretty much discounted the Koss UR40 due to its excessive sound leakage... so can anyone tell me which one would sound better? I am on the verge of jumping on the HP460 but the HD202's 300+ 5-star reviews on Amazon and Newegg's 200+ 5-star reviews are REALLY scaring me.

1Time, thanks for the Roland RH50 suggestion but again there's the problem that it's just not that widely known. There's one review on amazon, and googling results with a review from IGN and somewhere else. Sorry, but I just can't soundly purchase headphones based on one or two reviews when the ones I've listed have been backed by many.
Anyways, so now its the Philips HP460 vs. Sennheiser HD202 ... ... ... vs. Koss UR20 thread! WOOH!