If I may....I am the opposite, I own the same car as you Maz twas my dream also (well, besides an M3 or an AMV8 ) to own a GTR. Luckily I found it here in Perth so if you have imported there ones difference between us.
Full comp insurance for me is easy enough to pay for along with my loan, fuel etc and also the mods I have added in the past year of ownership. But, thats the thing, I love it so much I spend pretty much all my money on it .
Its a daily driver and I consider myself a good driver, very aware of OTHERS actions on the roads. I drive it through peak hour traffic every day and give it a bit of stick where I can and have no worries about problems at all. I have had no worries and the old girl has given me no problems.
Also, piece of mind helps....mine was rebuilt (god knows why) at about 96,000km's by the previous owner....It still has ceramic turbos as well.