bargain

[VNA]

It's very difficult to predict which bikes will be regarded as desirable/collectable  in years to come.

True.

But I put money on 1992/3 CBR900
1999 - 2001 R1

Already firming up.  Hard to find original ones, which is what you want, but they are out there and will eventually change hands for silly money in years to come. 

VTR1000SP2 is rising rapidly in price, you already have to have a fat wallet to bag one.  SP1's are firming up too.

One thing about bikes as you move on from the 70's is the increasing amounts of plastic. It's easily marked and damaged and difficult to repair.