In 10-20 they will be worth a fortune.
If I had a spare (really) 65k I would buy that black one in a second, its mint. I guess I have a deep attraction to these cars (along with e30 m3's and sierra's, both are on my hit list to buy) because I grew up with them thumping the V8's.
Buy some dvd's from Pitstop on the 90, 91 and 92 Bathurst races or the ATCC series, some great stuff on there.