Hi di, and welcome.
I like your choice, having a rather nice Midnight Purple GTR33 myself (as well as the manual and auto GTS25t versions).
Most people who worry about the costs either never had a GTR or have a busted arse R32 that has been flogged or smashed. Then fixing them can be exxy as every scamming workshop adds heaps as soon as you mention GTR. Some items cost more, like larger rubber and they use a little more fuel due to lugging extra weight but otherwise are almost dollar for dollar to run as a nice GTS25t.
Also I don't know what the insurance grief is as I only pay about $850 fully comp, but that company has almost no imports so the accident repair rates are almost non-existent, and don't ask cos then everyone will want to use them (and there go my good rates;))
Before you take Snowies advice ask what his finders fee is B) :cheers mate: but if he reckons it's good then take a look.
Again, good luck finding a nice one.