As you know I have the akebonos fitted to my zed ......... I've read a few threads on the US forum about them , but from first hand experience ( only a few have actually fitted them on here so it's all only what they have read) they are better than the brembos ..... By how much is debatable ... But for me they were a marked improvement over the brembo set up . How many issues have you read on here about 370z brakes?
....... But they are heavier as dan said and its unsprung weight , so will / does affect handling / balance of the car . Everything you modify on a car has good points and bad , it's just weighing up what's good for you .
The 6 pot torqen package looks great and no doubt are alot better than the brembos / akebonos but are alot more to buy .
If I were you I'd be getting the extreme clutch combo from Clark Motorsport because at 91k it's not going to be long before you need it anyway , I've heard it in the flesh and its really not worth worrying about . I think the lighter the fly the more rattle . But the extreme is a good compromise between light and not too noisy .