Tnx mate, do you know how much they take to make it? UPDATE: checked their page and saw the handle sony XBA-Z5 but don't have for MDR-Z7 bummer
I know that you have been looking to update your phones to balanced for a long time and that you are on a tight budget. I would say it's wise to get a cable for the Z7 before the Z5, as it will benefit more from the additional power. The stock Z1R balanced cable is very nice, if you can find one. It is not that expensive, built like a tank and has a fantastic 90 degree plug. The part number is a-2144-925-a. You can order it
here, but it appears to be out of stock right now. For the Z5, I would not recommend the Sony Kimber Kable. I tried it on my SE846's. The MMCX plugs were flimsy and loose. I also found the cable to be uncomfortable over the ear for long periods. I cut the plugs off and re-terminated for my Sennheiser 800's, which worked out beautifully. I would strongly recommend the
Onso cable for the Z5. For $85 USD, I feel it is a steal. Very thin, light and flexible. Strong, tight MMCX plugs. Beautiful 90 degree 4.4mm plug. I bought 2 of them. One to have as a backup. If you would like to try it out before you make any decisions, let me know and I'll ship it down to you.