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Amp for CIEMs
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From what I've seen of the FR and CSD of the C4, you'll want as wide bandwidth an amplifier as possible with as low an output impedance as possible. The C4 is only 25 ohms @1 kHz and will drop to at least as low as 15 ohms in some frequencies, so that's why you'll want a low output impedance amplifier. Damping factor is usually recommended to be over 50, but some people say that it can be acceptable at 30, so if you want adequate damping factor across the entire audible bandwidth, you'll want an amplifier that has <=0.5 ohm of output impedance. You'll also want a volume attenuator that gives you fine control and low gain so that you don't ruin your ears, as the C4 is very sensitive. A b22 will work, if you want to spend the $$$$...
Looks good, but someone else with more DIY expertise should answer (perhaps you should ask in the DIY forum); my experience is limited. Stepped attenuators may possibly run into trouble with input/output impedance matching, but I really don't know how it works.