I've had my GTR since march last year and so far i've used..
BD4's - Very close to my work, they did some major servicing, installed HKS front pipes.Very professional outfit and have turned out some quality cars in the past. HKS australia distributor.
CRD - Checked out the car on the dyno and did a general service. Possibly the most expensive place a GTR owner can take their car can do & supply everything just about!
Unique Auto Sports, Castle Hill - Done a whole heap of things to my car, from power fc tuning to replacing worn bushes. Good friendly local place with excellent Skyline & import knowledge.
MRC, Castle Hill - Ex employee of UAS, knows his stuff really well. Diagnosed a few small problems after i put the turbo's put back on my car. Doesn't have a big workshop or a huge amount of stock so prices are very good for the quality work done.