Have a look at Steves Red 350z from Redline Styling if its still for sale. Real cracker..
http://www.350z-uk.com/topic/94069-nismo-chilli-red-350z-gt-296-2006-for-sale/
Spend as much as you can afford on the initial purchase. Buy cheap and you may find you are spending much more than 5k to get it right unless you are lucky. Lots of good advice on buying cars on here. Be patient. There are a few nasty examples around..
Here s mine with the charge speed rear bumper (tweaked for my ARK Grip) with side skirts to match. Supplied and fitted by the best body shop on here (in my oinion) RT Performance. They will make supply and fit the chargespeed for you...
I am a good friend of the above so wouldn't disagree with him as it all about opinions. When I had mine fitted by RT I was speaking to Taras. He had an ARK on his 350z and has fitted others and just gave me his advice not do it as it changed the exhaust note which is superb as is. Just my opinion but not saying its a NO NO. Would try it without first personally.