So that's about 85% of the original price. I don't think that is too too bad, though usually I try to get headphones for closer to 75% of their original price (if not less). Of course this depends on the headphone. LCD-2 is all the rage now, while a pair of Grados might only fetch closer to 50% That makes all the difference in the world.
I don't know if the warranty is transferable with Audeze- others may know. Given that they have a three year warranty and you know they're comfortable to you- that alone is a good reason to buy new in my book (assuming the warranty only covers the original owner).
I'm buying new myself, but I also waste a lot of money buying new stuff then selling it :(