Hi Ad,
I had the same needs as you for my Z1000 as I often do spirited riding.
I would highly reccommend the Renthal Ultra Lows.
They are road bars, not dirt bike bars, so there is good sweep back to keep your wrists comfortable when leaning off the bike.
They are lower and very slightly wider than the stock ones.
The Ultra Lows are all the rage with the Zed owners in the UK & USA for these reasons.
Daz.
p.s. If you are in Melbourne you are welcome to ride my Zeddie to check their suitability.