HP Designjet 10PS RIP/PPD/Driver needed for OSX10.5.6 to use in Quark6

Hi,
I have a new iMac running OSX10.5.6 and can’t select the driver/RIP for my HP Designjet 10PS from Quark Xpress 6. With a bit of help from the Quark forum I have got an older printer (HP Laserjet 5000) running fine, so know what to do. It recomended try and get a third party driver/RIP for the 10PS. So can anyone point me in the direction of a Free/Shareware/low cost driver/RIP please. I’ve located some around ?300-1000 which is cost prohibitive/totally unviable for home use

Regards
IAN