Thank you, but not so easy with shipping distance/time/cost. Have you compared HD580 to HD600 directly (i.e. same amp etc)?
600 are a major step up from 598 - I could not keep 598 for long ... (they may be just right for someone else ...)
In any case 600 are no 600 unless you change the stock cable to a better after market one - upgrading cable takes 600 for a mid-fi to hi-fidelity ... but 600 is not 600 unless you really amp it properly - I think most high end phones need proper amplification to bring the best out of them. Some people swear that 600 with after market balanced cable and balanced amp is as good as it gets ... to my ears they got as good as recabled 701 with more bass and slightly different tonal balance ...
Of course we have our preferences and unfortunately budget and space constraints ...
940 is a nice step up from 840 - I just sold my 840 for $99 + shipping - they were quite good - surprisingly good - but they are slightly uncomfortable on the head-band ... 940 have all the good qualities of 840 - but they are better all around (more detail) - slightly lighter, more comfortable - easy on the headband and velor earpads ... they are more expensive too ...
Are 600 better than 940 - yes, recabled 600 were quite a bit better than 940 ... but 940 are more comfortable, closed type, much easier to drive - hook them up to ipod and enjoy the tunes and are just more portable .... you can do that with 600 too but they won't sound their best ... 940 are no fuss phones ... and I like them for that ...
I feel there is a need for "Trade/Rent/Swap" hifi stuff ... with no obligation to buy ... my hi-fi journey has been nothing but educational for me ... albeit - a very expensive one ...
Cheers
Sunil.
PS: The best bet would be local exchange - where no shipping is involved ...