Bob you are right about recent Japan prices and the currency changes - I have myself tracked the market over the last few years and even imported directly.
But... The question was what it was worth in the Australian market and frankly the local market hasn't caught up with the overseas market in my opinion. Not yet anyway!
Heck i was looking at this vspec in black,109,000km from auction a little while ago for around $25k landed and complied (81 yen to dollar). In hindsight that was one I should have bought, only missed out by a little!
http://www.j-spec.com.au/recent/1993-NISSAN-SKYLINE-GT_R_V_Spec_-154270.html
And here another recent one for under $30k landed and complied , vspec2, grade 4b, white, 65,000km
http://www.j-spec.com.au/recent/1994-NISSAN-SKYLINE-GT_R_V_Spec_2-187208.html
Both the above examples didn't have any Japanese reg "shaken" left so we're good value for export. The ones you have cited mostly have reg plates and 'shaken' left and so can increase the sale prices a few thousand dollars over no 'shaken' vehicles and they are usually sold locally in Japan for that reason.
i would be interested to hear what others think as well....
Where is Iron Chef???