for what its worth think of it this way
yeah sure your wasting almost $300 bucks a pop - but whats worse - buying a dud because your impatient, next thing you've got a car sitting in the driveway thats f**ked which will cost a couple of grand to fix..
trust me, i was pulling my hair out for months trying to find a decent skyline. Luckily RACQ actually reduce the costs of an inspection if your bringing multiple cars in. I must have brought about 3 cars to racq, the worst of which the mechanics refused to give me the keys back as the front left wheel was just about to fall off. the mechanic said your f**king crazy for even driving this let alone thinking of buying it. but anyway.. i ended up buying my current car.. i was not 100% satisfied with it, but then again it was a decent price, made up a load of bs to the seller that the turbo was on its way out, got the car for about 3 grand less than what he wanted..
brought it to my mechanic, he said there are a few very minor problems but apart from that the car is in fantastic condition for its age (have had the car for 12 months, hasn't missed a beat) only problem i have a small clutch problem which is an easy fix.
all in all - you will never find a skyline that your 100% happy with, you just have to be patient, willing to spend a little bit to get the decent ones checked out.. but as a rule of thumb with imports.. if your budget is e.g $15k - try go for a skyline around the $12K mark - keep some cash in your wallet as your bound to run into a few problems.