An iMac isn't the best choice to run Photoshop. Current versions of Photohsop take advantage of the Altivec (Velocity Engine) unique to the G4, so you will see significant performance difference between a G4 and an iMac (G3) with Photoshop. G4 towers now come with CD-RW, 4X AGP, 133 MHz buss, and reasonably good graphics cards.SCSI cards can still be added to them at low cost for older scanners - USB and Firewire for newer ones (I am still running an old HP SCSI scanner I bought in '94 with its original supplied Mac software, still works on OS 9.1. OS X also is shipped with the OS 9.x installer, and there is nothing to prevent installing OS 9 as the primary OS (I partitioned the hard drive and have seperate OS X and OS 9 partitions, some software I must run isn't yet compatible with OS X Classic mode. (booting from any drive or partition is pretty straight forward in the Mac environment).