I know this isn't the for ale forum just want to ask...A mate has a 1997 XR6 ute in almost perfect condition...redone interior...170 k on the clock ..etc....How much should he put on it dollar wise.

have a look at redbook
http://www.redbook.com.au/

then have a look at some examples on Carsales
http://www.carsales.com.au/

and decide on a price which is fair for both him & the buyer. Its only worth what someone is willing to pay, and what else is out there.