there's definitely a sonic difference between the 104.2s and the later uniq stuff. based on the conventional wisdom that you want your center to match your fronts as closely as possible, i'd opt for the 102.
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Thanks for the advice, Loomisjohnson. I bought two pairs of mint KEF Reference 102s, and have replaced the KEF 200C with one of the speakers. The 102 is indeed a better match with the 104.2s. The soundstage in 5.1 is now seamless, whereas music seemed uneven across the soundstage with the 200C. I plan to use the other 102s as surrounds.