I have to disagree with X-Ray about the MKIII. In my oppinion it was well overpriced the day it came out and still usually is when bought used.
To sum up the benefits of a MKIII over an MKII:
- Faster RAM-interface (64 bit, you have to have two matching RAM-modules in socket 1,3 and 2,4)
- SCSI onboard and UW instead of fast SCSI-II with the MKII SCSI-modul (but you hardly feel the speed in everyday use, as long as you don`t move huge amount of data e.g many GB around every day, or when makeing a total Backup. I managed to get 26 MB/s out of my CSPPC at best compared to about 8MB/s with my MKII / SCSI-kit)
- Bootmenu that lets you configure the SCSI-controller and kill the onboard IDE and aktivate a preparemul like option.
- Possability to connect a CVisionPPC (but there really is no point of doing so without a PPC, for 2D any ZIII card is more then good enough and for 3D stuff a bare 060 lacks the power, though I have heard Freespace should be playable with that setup)
Another Problem is that it has the same 68k-socket dieing Problem as the CSPPC as it is the same design.
If money it tight try to get a MKII / CyberSCSI kombo (alternatively a Fastlane ZIII is a good option too, but make sure it has a 8.x ROM). If you stumble over a pile of money you have no better use for go all the way and get a CSPPC.
As for prices, I don`t know how it is in the UK but here in germany this are common going prices:
MKII 060: ~100-120 EUR
SCSI-Kit: ~ 60-70 EUR
MKIII 060: ~ 200 EUR
CSPPC 060/200: ~ 380-430 EUR
CSPPC 040/180: ~ 200-250 EUR