The other option is of course a PC running XP, which should be easier to find, cheaper (I daresay Jim might have one for fuck-all), and also likely more straightforward to get a (less expensive) PCI SCSI card up and running, and easier to get the associated (cheaper) peripherals, and also easier to keep the associated software running without incurring further costs. Not to mention any replacement parts will be more readily available for less outlay, should anything fail. Not to mention it has already been tested to run on such a machine without any issue. But you want an apple on it right, if its going to be under a desk?