I had a pair of K1000's a number of years ago. While I was impressed with their build quality and I did like the sound, the fit and feel, for me, were just not a great match. A secondary issue was that I didn't feel like my headphone amp at the time (Bottlehead SEX amp, probably what would now be called the 2.0 version) had quite enough oomph to drive them.
Everyone is different, so the fit and feel of headphones are always quite personal. The K1K's, though, are much different than the typical over the ear cans, so one's reaction to them is perhaps harder to predict than most. I seem to recall reading that they're out of production, so I'd guess that may lead to rising prices.
If I had a grand to throw at a new set of cans, I'd be a lot more likely to look for a pair of HD800's or perhaps consider a foray into the electrostatic world, as opposed to going back to K1K's. Just my $0.02, your mileage may vary, past results are no guarantee of future returns and objects in mirror are closer than they appear - the usual disclaimers.
