Sorry, just realised it's the 601 you have, not the 612! Well, in that case, I'm sure the K712 will be a very noticeable improvement to you. Still, I stick by my word about trying something leftfield!
That's my instinct as well. I'm really excited to try the HD700, as based on what I like about my current headphones, I think it will bring together a lot of qualities.
I do enjoy a variety of phones - I just need to break out of the price point I've looked at because in the 100 - 200 range a lot sounds similar. I really like my k601s... but we'll see. Like I said, I'm lucky to have some places to demo. I won't really be able to provide great feedback on phones here, I just don't have the vocabulary to do it - but I will know what I like the best!!
And by the way - thanks for the conversation, its exactly what I was looking for. Not too many people to geek out with between my wife and two kids (3 years and 2 years). I'm working on the kids though!
No worries, it's good to talk! I myself pulleg the trigger on the HD700s. A few weeks back, a number of pairs went on ebay for around £2-300, which is an amazing price. I was condisering them rather than the HD800 due to price (obviously) and that they are supposed to be more 'fun' and less analytical. The other issue with the HD800s is not just the price of the headphone - once you get them, you are opening up a very expensive search to amp them right to get the best out of them and I nor my wallet really fancied that. Therefore, the HD700 seemed like the wise option, with maybe a good chunk of the qualities of the HD800 but cheaper and with more bass, easier to amp etc. However, what changed my mind was the complaints of a strident/peaky/problematic treble. I've had those issues with the HE400 and don't want to go through that again! Also, the HE560 are supposed to outclass them in every way and even pull punches with the real big boy flagships for much the same price or just a little more..