Thanks for all your suggestions. And it's obviously a conundrum a few of us are having.
But essentially, the answer is no, not yet :(
Here's the problem I having.
It's really difficult in Bristol to try out headphones. Well, to clarify, to try headphones that aren't
b) Dr dre or Phillips cheapies
c) Very expensive Audio Technica's
A number of the shops who sell decent headphones have to order them in, or if they are in store, won't get them out of the box (Richer Sounds/Sevenoaks)! And the thought of buying pairs and pairs of the things from Amazon and sending them back, sinks me into mild depression. So I feel I must put my audio purism onto the back burner :(
Audio T on Park Street (Bristol) have been great btw. They stock mainly Sen's with a couple of AudioTecnica's and allow you to spend as long as you like listening to them.
In there I heard a pair of HD 439's a few months back which for only £80 were very impressive. And I plan to go back with my headphone amp and Pure i20 dac and listen again.
On the other hand I may 'Amazon test' a pair of KRK 6400's, which one seemingly reputable reviewer on this forum has suggested people with HD598's would like, and for £80 are a bargain. Recently I tried on a pair of the next level up - KRK8400's and they felt lovely, and I mean really light and perhaps even more comfortable than the 595's. The differences between the 8400 and the 6400 are the more expensive pair (8400) has velour pads and a memory foam headband pad, plus slightly more rangier drivers. For those who want to master either sound like a good choice of closed back cans especially if you only want to spend £80.
But however nice these may be, and even though the Senheisser 439's were very engaging they won't be 595's.
So all that probably doesn't help you all with the decision to swap to a 'like-595-but-with-a-closed-back' decision, but it gives you an idea of where I am heading.
STOP THE PRESS.......There is a new hi-fi store I haven't been to yet, so hold your breath folks, there may be more news in this one yet!
PS All KRK's and the HD439's referred to above are closed back.
Edited by Andymaxwell - 11/20/12 at 10:15am