I think that 32 GTR's in good condition are already at a very high value, considering that I've seen an example that was very very clean and completely stock sell for close to 20k, I'd say there already pretty expensive for what they are.
The biggest problem is, as mentioned already, is there isn't really any concourse condition 32 gtr's around in aus, there prob is of the aus delivered ones but not imports.
I dont think there is a big enough demand for clean 32's yet, but maybe in 10 years or so, you'll prob see mint 32 gtr's selling for the same as 34 gtr's.