Thanks all for the responses. Looks like all of the common tasks for OS4 are things I do with my Mac (and wouldn't want to do on my Amiga which is upstairs). So as much as I want to be able to say I can run OS4, I really can't justify the expense of the CSPPC upgrade just so I can boot OS4 once in a while and say "yes, it is quite fast isn't it", then boot immediately back in to 3.9 to do something else.
Bloodline, if you're reading, you know what this means don't you? ;-)
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moto