Pretty Silly comment really. Yes the newer models arnt as easy to modify and will cost more in basic needs as you cant just bolt any old Skyline part on them. But from teh factory they are a nicer driving car with a far superior interior. Along with that they have more power in standard form. There are more and more parts becoming available and as you live in Vic you are lucky as you have Scotty to go to for those much needed custom parts.
Really just comes down to what you are looking for, But as others have said unless its a manual and in perfect condition you are crazy to buy a C34 model thats over 10 grand.
IMO get the newer M35 and visit Scotty for some go fast bits