Just so you know Axxis is one company and Hawk is another. For the longest time Axxis Metal Master were supposed to be THE good street pad. IME they suck donkey balls. They warp rotors and start to come apart in big chunks when they get too hot, which is way too fast. I know Axxis makes a bunch of pads, but the Metal Master was supposed to be the one for the Z. I have also used their organic pad on a friend's Z, that was fine for an organic pad. Wouldn't put it on a car that is driven hard though...
Hawk makes about 10 different pads, and only 2 of them are for street driving, the HP and HP+. The rest are full on race pads.
Porterfield makes the R4S which works good on the street but they aren't up to high stress track day type situations. I believe you can get R4S shoes as well.
KVR supposedly makes good pads/shoes. Haven't tried them myself, but I hear good things.
If your car needs pads NOW, I'd just go get some some crappy organic pads from the auto parts store. Then order your good pads and swap the pads out. You don't need to turn the rotors to swap the pads, and it will keep you from going metal to metal now, and lucky for us a brake pad swap in a Z is a 30 minute deal.