The IIci in my humble opinion, was (is) the best Macintosh Apple ever made. I have three of these machines right now, and they all work like champs.
The IIci is indeed faster than the IIsi, although the IIsi has some sound imput capabilities the IIci doesn't. You can find all kinds of older NuBus video cards to put in the expansion slots, as well as older NuBus networking cards if you ever need to use the machine as any kind of server.
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-Eliott Wolfe
Winnetka, Calif