Dunno about anyone else, but the guys at www.gtprojects.com are great and i also checked out the peoples at http://www.prestigemotorsport.com.au/
they don't really do quotes though, they can give you a rough idea of what they think they can get you a r32 gtr for thou, no exact $.
to give you a bit of an idea, gtr's in japan (correct me if im wrong) start at about (aus)$12,000 landed in aust, but i don't think i would wish one of them on my worst enemy, at that price they would have to have been thrashed quite a bit.
there is a good article in no. 46 of HPI (High Performance Imports Mag) that talks about importing a 1989 r32 gtr, what to look for and what not. I think HPI say that you would want to pay about $(aus)25,000 on road for a good r32 gtr (1989)
get the mag and read thou.
hope this helps