I do have got a Blizzard 1240 in my room but I somhow prefer the 1230/4 50/50. Wouldn´t it help to use loads of memory and copy most of the Workbench into Ram Disk and use other programs like Fblit to speed it up a bit to a decent level ? After all, an 68040/25 is not much faster than an 68030/50 or is it ???
PS : I also posted the message on our club site at this link