I like the IIci, it seems to be a faster IIsi! I would like to bring my IIsi up to speed though, with a 25 Mhz cpu clock, and maybe see if I can hack a IIci cache card in there.

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That is exactly what it is. The IIci represented the high end of the market at the time and when the IIsi was introduced later, Apple throttled the processor speed back to 20MHz so that the IIsi didn't eat into the IIci's market base.

The IIci is certainly a decent 68K and is wonderfully easy to get into for installing cards etc.

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Yeah, actually, with the NuBus adaptor card, a IIsi has all the same parts as a IIci, minus the cache card, and the fact that the SCC/SCSI is on one chip not two. I wonder if the IIsi Rom contains the logic for a cache card. Since the cache controller is attached directly to the 68030 bus thru the PDS and has no ROM, I'm assuming this needs ROM support to see the controller on the bus, and some toolbox routines to make the machine aware it's there, and flush/manage it. I'll do some MacsBug work on the IIci and see if i can find out for sure. I know the IIsi has the _SlotManager additions to read and write data over Nubus, even though it doesn't have a NuBus controller without the adaptor card, so a similar mechanism must be true of the cache controller.