If you're going to do pads and rotors might as well do lines and fluid also   - you're looking at around £1.5k including fitting for decent set up including braided lines, Ferrodo pads, PF front rotors, DBA rear - there are other combinations available but couldn't comment on them as haven't tried them 
pads here http://www.350z-uk.com/forum/viewtopic.php?f=157&t=27438 
front rotors here http://www.350z-uk.com/forum/viewtopic.php?f=157&t=27437 
rear rotors here http://www.350z-uk.com/forum/viewtopic.php?f=157&t=31541 
  
for rest of set up and some other options