Meh, the older Skylines are secksi as hell but unless you have a bajillion dollars to dump in them they are kinda slugs.
You guys all aim too high, dream cars are more fun when they're attainable. Already owned one of my cheap'o white trash dream cars. Some others that are possibilities for the future include a 91/92 Firehawk (any will do, but one of the 3 with an aluminum block would be better, a 91/92 B4C/1LE, a 97 SS 30th anniversary(preferably LT4), or even though I would never hear the end of it a Terminator would make me smile as well. The best thing is they are all within the realm of possibility.
I used to really want a Holden Monaro or Commodore, right hand drive, LS1, 6-speed just to be different. But then they brought the Monaro to the US put the steering wheel on the other side, and called it a GTO which blew the mystique for me. But the GTO is a nice car and tons of fun to drive.