Read here: http://www.350z-uk.c...rced-induction/
And here: http://www.my350z.com (I strongly recommend NOT posting on this forum the way you posted here. They will tear you apart).
SInce you don't yet have a budget in mind, I suggest you do some serious reading and decide what you want.
If you want over circa 400bhp you're gonna need a built engine and that means ££££££.
S/C can be done for around £5k now, provided you do the fitting yourself. Don't forget ancillary things - fuel rail, uprated injectors, fuel pump etc etc.
There are a few manufacturers - HKS, Vortec, GTM....
Not up to speed on TT kits at the moment, but I think it's probably around £10k