Personally I like the 280z better than the 260z Rare cars are cool and all but the roof-line of the 2+2 is just ugly IMO.
Either way it's not like you can just go to the Z store and buy another Z car... those things are rare gems in our area (north east us) rust seems to demolish most cars inside 15 years... if they last longer than that it's a miracle.
Personally, there are only 2 Z cars that I would go out of my way to own and the 280 isn't one of them. If I was going for old school I'd import an old school imported Datsun.
69 Skyline GT
Or maybe a 510 or 710.. mmmm