Honestly.. If you want a decent NA.. dont get an NA skyline. They have smaller brakes.. 4studs.. open diffs.. weaker boxes..
There are HEAPS of awesome NA's out there that should be thought about before buying an NA skyline:
SR S13
RX7
Type R
1.8L MX5
etc..
Skylines are not the answer to ALL of the worlds problems.. just most of them..